An Afghan man is silhouetted as he rides on a donkey, in Herat, Afghanistan, December 29, 2014. Afghanistan's economy has improved, with the help of international aid, after suffering decades of fighting. (Photo by Jalil Rezayee/EPA)

A couple sits under a street lamp in a park near Christmas lights in central Tokyo, December 12, 2014. (Photo by Thomas Peter/Reuters)

Children displaced from Pakistani tribal areas due to fighting between security forces and militants play under a tree during the last sunset of the year on the outskirts of Islamabad, Pakistan, Wednesday, December 31, 2014. (Photo by B. K. Bangash/AP Photo)

A pump jack is seen at sunrise near Bakersfield, California in this October 14, 2014 file photo. Oil prices fell on Tuesday, with Brent mired near a 5-1/2 year low close to $60 per barrel, as Chinese factory activity slowed for the first time in seven months and stumbling emerging market currencies dented demand expectations. (Photo by Lucy Nicholson/Reuters)

A man is silhouetted as he arrives at the Airbus headquarters during the first delivery of the Airbus A350 XWB new passenger jet to Qatar Airways in Toulouse, southwestern France, December 22, 2014. European planemaker Airbus delivered its first A350 mid-sized jetliner to Qatar Airways on Monday and moved to end speculation about the future of its larger A380 superjumbo. (Photo by Regis Duvignau/Reuters)

A stork flies back to its nest during sunset in Nakhonsawan province, 270 km (167 miles) north of Bangkok December 23, 2014. (Photo by Chaiwat Subprasom/Reuters)

A couple hug each other in front of a light installation for Christmas celebrations in Beijing December 23, 2014. (Photo by Kim Kyung-Hoon/Reuters)

A worker is silhouetted against the setting sun while installing an overhead electric cable pole on the banks of river Ganges in the northern Indian city of Allahabad December 26, 2014. (Photo by Jitendra Prakash/Reuters)

People walk in Dunham park near Altrincham, northern England December 29, 2014. (Photo by Phil Noble/Reuters)

A boy jumps from a swing during sunset in Valras-Plage, southern France December 29, 2014. (Photo by Yves Herman/Reuters)

The sky is illuminated near the beach during sunset in Valras-Plage, southern France, December 29, 2014. (Photo by Yves Herman/Reuters)

A woman exercises as the sun rises over Victoria Park in Leicester, central England, December 30, 2014. (Photo by Darren Staples/Reuters)

A woman runs through Victoria Park at sunrise in Leicester, central England, December 30, 2014. (Photo by Darren Staples/Reuters)

A Palestinian man carries a surfboard during sunset in the Mediterranean sea off the coast of Gaza City December 31, 2014. (Photo by Ibraheem Abu Mustafa/Reuters)

A Palestinian rides a horse on Gaza beach at the Mediterranean sea during sunset December 31, 2014. (Photo by Ibraheem Abu Mustafa/Reuters)

A tourist poses for a friend (not pictured) as if to hold the sun as New Year's revellers welcome the first sunrise of 2015 on Sydney's Bondi beach, January 1, 2015. (Photo by Jason Reed/Reuters)

A couple acts out a martial-arts move for a friend's camera (not pictured) as they wait to welcome the first sunrise of 2015 on Sydney's Bondi beach at dawn, January 1, 2015. (Photo by Jason Reed/Reuters)

A boy paddles in a pool in front of Punta Hermosa beach, south of Lima January 2, 2015. (Photo by Mariana Bazo/Reuters)

A couple looks at the Mediterranean Sea while on a walk on a sunny day in Valras-Plage, southern France January 4, 2015. (Photo by Yves Herman/Reuters)

A woman passes by cats after rainfall, in the southern port city of Limassol, Cyprus, Sunday, December 14, 2014. Steady rain, overcast skies and unseasonably cold temperatures over the last 48 hours have resulted in more than twice the average monthly precipitation in the east Mediterranean island. (Photo by Petros Karadjias/AP Photo)

A multiple exposure picture shows Klaudia Medlova of Slovakia in action during the women's Snowboard World Cup Big Air Istanbul, in Istanbul, Turkey, 20 December 2014. (Photo by Sedat Suna/EPA)

A Sri Lankan tsunami survivor looks out to sea during the commemoration of the tenth anniversary of the Boxing Day tsunami on December 26, 2014 in Paralliya, Sri Lanka. Sri Lanka was one of the worst hit countries of the 9.1 magnitude quake with around 35,000 deaths. Throughout the affected region of eleven countries, nearly 230,000 people were killed, making it one of the deadliest natural disasters in recorded history. (Photo by Buddhika Weerasinghe/Getty Images)

Startled gulls rise and turn into a stiff offshore wind at Malibu Lagoon in Malibu, Calif., Thursday, December 25, 2014. The winds, following a cold front that raced through the state overnight, swept skies clean and whipped up whitecaps along the coast Thursday. (Photo by John Antczak/AP Photo)

Two cyclists are reflected in a puddle shortly after a storm on the banks of the river Rhine in Duesseldorf, Germany, Thursday, December 11, 2014. (Photo by Marius Becker/AP Photo/DPA)

A silhouetted employee carries a tray of massage oils at the Banyan Tree Macau's spa at the Galaxy Macau casino resort, operated by Galaxy Entertainment Group Ltd., in Macau, China, on Thursday, May 8, 2014. (Photo by Brent Lewin/Bloomberg)