Fireworks explode over the Quadriga sculpture atop the Brandenburg gate during New Year celebrations in Berlin, Germany, January 1, 2019. REUTERS/Axel Schmidt 

Fireworks explore during New Year celebrations at the Waterway in Cairo, Egypt Januart 1, 2019. REUTERS/Amr Abdallah Dalsh 

Fireworks explode near the Alexander Nevski cathedral during the New Year celebrations in Sofia, Bulgaria, January 1, 2019. REUTERS/Stoyan Nenov 

Fireworks explode over the Alexander Nevski cathedral during the New Year celebrations in Sofia, Bulgaria, January 1, 2019. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY 

Fireworks explode over the Alexander Nevski cathedral during the New Year celebrations in Sofia, Bulgaria, January 1, 2019. REUTERS/Stoyan Nenov 

Fireworks explore during a New Year celebrations at the Waterway in Cairo, Egypt Januart 1, 2019. REUTERS/Amr Abdallah Dalsh 

Fireworks explode over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations in Athens, Greece, January 1, 2019. REUTERS/Yannis Behrakis 

Fireworks explode over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations in Athens, Greece, January 1, 2019. REUTERS/Yannis Behrakis 

Fireworks explode over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations in Athens, Greece, January 1, 2019. REUTERS/Alkis Konstantinidis 

Fireworks explode over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations in Athens, Greece, January 1, 2019. REUTERS/Yannis Behrakis 

People take part in a New Year celebrations in Cairo, Egypt December 31, 2018. REUTERS/Amr Abdallah Dalsh 

People use their phones to take photos of the Burj Khalifa as it is lit up during New Year celebrations in Dubai, United Arab Emirates, January 1, 2019. REUTERS/ Hamad I Mohammed 

Fireworks explode over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations in Athens, Greece, January 1, 2019. REUTERS/Alkis Konstantinidis 

Fireworks explode in the sky during New Year celebrations in Moscow's Red Square, Russia January 1, 2019. REUTERS/Tatyana Makeyeva 

Fireworks explode in the sky during New Year celebrations in Moscow's Red Square, Russia January 1, 2019. REUTERS/Tatyana Makeyeva 

Fireworks explode over the ancient Parthenon temple atop the Acropolis hill during New Year's day celebrations in Athens, Greece, January 1, 2019. REUTERS/Alkis Konstantinidis 

People hold up their mobile phones as they gather on the Champs Elysees during the New Year's celebrations near the Arc de Triomphe in Paris, France, December 31, 2018. REUTERS/Christian Hartmann 

People use their phones to take photos of the Burj Khalifa as it is lit up during New Year celebrations in Dubai, United Arab Emirates, January 1, 2019. REUTERS/ Hamad I Mohammed 

The Burj Khalifa is lit up during New Year celebrations in Dubai, United Arab Emirates, January 1, 2019. REUTERS/ Hamad I Mohammed 

A person gestures next to yellow balloons during the New Year's celebrations in Paris, France, December 31, 2018. REUTERS/Christian Hartmann TEMPLATE OUT 

People take photos as a person wearing a yellow vest lights a flare during the New Year's celebrations in Paris, France, December 31, 2018. REUTERS/Christian Hartmann 

People attend a New Year party in front of the Brandenburg gate in Berlin, Germany, December 31, 2018. REUTERS/Axel Schmidt 

People walk past street vendors at the Uhuru Park grounds during the New Year celebrations in Nairobi, Kenya January 1, 2019. REUTERS/Thomas Mukoya 

A marabou-stork flies within fireworks displayed during New Year celebrations in Nairobi, Kenya January 1, 2019. REUTERS/Thomas Mukoya 

Fireworks explode over the UAP Old Mutual Tower during New Year celebrations in Nairobi, Kenya January 1, 2019. REUTERS/Thomas Mukoya 

People gather on the Champs Elysees during the New Year's celebrations near the Arc de Triomphe in Paris, France, December 31, 2018. REUTERS/Christian Hartmann 

Revellers enjoy during New Year celebrations in Moscow's Red Square, Russia January 1, 2019. REUTERS/Tatyana Makeyeva 

Fireworks explode in the sky during New Year celebrations in Moscow's Red Square, Russia January 1, 2019. REUTERS/Tatyana Makeyeva 

Fireworks explode in the sky during New Year celebrations in Moscow's Red Square, Russia January 1, 2019. REUTERS/Tatyana Makeyeva 

People watch as the Burj Khalifa is lit up during the New Year celebrations in Dubai, UAE January 1, 2019. REUTERS/Satish Kumar 

Fireworks explode in the sky during New Year celebrations in Moscow's Red Square, Russia January 1, 2019. REUTERS/Tatyana Makeyeva 

A man lights candles at a sand sculpture built to mark the New Year on a beach in Mumbai, India, January 1, 2019. REUTERS/Francis Mascarenhas 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

U.S. Senator Elizabeth Warren (D-MA) is joined by her husband Bruce and their dog Bailey as she speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

U.S. Senator Elizabeth Warren (D-MA) and her husband Bruce walk away, after her announcement of forming an exploratory committee to run for president in 2020, outside their home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

People watch as the Burj Khalifa is lit up during the New Year celebrations in Dubai, UAE January 1, 2019. REUTERS/Satish Kumar 

U.S. Senator Elizabeth Warren (D-MA) walks with her husband Bruce to speak to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

U.S. Senator Elizabeth Warren (D-MA) walks to speak to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

People watch as the Burj Khalifa is lit up during the New Year celebrations in Dubai, UAE December 31, 2018. REUTERS/Satish Kumar 

U.S. Senator Elizabeth Warren (D-MA) gets in her vehicle, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

People watch as the Burj Khalifa is lit up during the New Year celebrations in Dubai, UAE December 31, 2018. REUTERS/Satish Kumar 

Revellers enjoy a ride ahead of New Year celebrations in Moscow's Red Square, Russia December 31, 2018. REUTERS/Tatyana Makeyeva 

Fireworks explode over the Burj Al Arab hotel during the New Year celebrations in Dubai, United Arab Emirates January 1, 2019. REUTERS/Suhaib Salem 

People watch as the Burj Khalifa is lit up during the new year celebrations in Dubai, UAE December 31, 2018. REUTERS/Satish Kumar 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

Fireworks explode over the Burj Al Arab hotel during the New Year celebrations in Dubai, United Arab Emirates January 1, 2019. REUTERS/Suhaib Salem 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

The Arc de Triomphe is pictured during the New Year's celebrations in Paris, France, December 31, 2018. REUTERS/Christian Hartmann 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters with her husband Bruce at her side, after announcing she has formed an exploratory committee to run for president in 2020, outside their home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

People hold balloons as they celebrate the New Year's countdown event in a road in Ahmedabad, India, December 31, 2018. REUTERS/Amit Dave 

U.S. Senator Elizabeth Warren (D-MA) is joined by her dog Bailey as she speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

Fireworks explode over the Burj Al Arab hotel during the New Year celebrations in Dubai, United Arab Emirates January 1, 2019. REUTERS/Suhaib Salem 

The Arc de Triomphe is pictured during the New Year's celebrations in Paris, France, December 31, 2018. REUTERS/Christian Hartmann 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters with her husband Bruce at her side, after announcing she has formed an exploratory committee to run for president in 2020, outside their home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

U.S. Senator Elizabeth Warren (D-MA) speaks to reporters, after announcing she has formed an exploratory committee to run for president in 2020, outside her home in Cambridge, Massachusetts, U.S., December 31, 2018. REUTERS/Brian Snyder 

A man dances as he celebrates the New Year's countdown event in Mumbai, India, December 31, 2018. REUTERS/Francis Mascarenhas 

People wearing masks blow horns as they celebrate the New Year's countdown event in a road in Ahmedabad, India, December 31, 2018. REUTERS/Amit Dave 

People dance as they celebrate the New Year's countdown event in Mumbai, India, January 1, 2019. REUTERS/Francis Mascarenhas 

People release balloons as they celebrate the New Year's countdown event in a road in Ahmedabad, India, January 1, 2019. REUTERS/Amit Dave