Question: What was the July 2017 net worth of the incumbent mayor of New York in 2013
Context: Alisher Burkhanovich Usmanov (Russian: Алише́р Бурха́нович Усма́нов ; Uzbek: "Alisher Usmonov" ; born 9 September 1953) is an Uzbek-born Russian business magnate.  As reported by "Forbes", in 2017, Alisher Usmanov has an estimated net worth of $15.1 billion.  The December 2013 Bloomberg Billionaires Index reported an estimated net worth of $19.6 billion, making him the 37th richest person in the world.  In May 2014, "The Sunday Times" listed him as the second richest person in the UK with an estimated fortune of £10.65bn. Robert Kuok Hock Nien (; born 6 October 1923), is a Malaysian Chinese business magnate and investor.  According to "Forbes", his net worth is estimated at $12.2 billion on July 2017, making him the richest person in Malaysia and second richest in Southeast Asia after Dhanin Chearavanont of Thailand, according to Forbes List of World Billionaires 2013 which Robert Kuok was placed 76th.  As of December 2012, according to the Bloomberg Billionaires Index, Kuok has an estimated net worth of $17.3 billion, making him the 40th richest person in the world. The 2013 election for Mayor of Buffalo, New York took place on November 5, 2013.  Two-term incumbent Mayor Byron Brown, a Democrat, faced Republican challenger Sergio Rodriguez. Tamir Sapir (birth name Temur Sepiashvili, Georgian: თემურ სეფიაშვილი ); 1946/1947 – September 26, 2014) was an American businessman and investor from the former Soviet republic of Georgia who made millions bartering fertilizer and oil with the Soviets in the 1980s; he took most of his money and put it into New York real-estate.  He was included in "The 400 Richest Americans List" of September 2008 (#246), with a net worth of $1.9 billion.  In March 2010, he ranked 721st on "Forbes"<nowiki>'</nowiki> list of billionaires, with a net worth of $1.4 billion. Hilarion Tumi Vendégou (born 4 September 1941, Isle of Pines) is the present high chief of the Isle of Pines, in New Caledonia, and the incumbent mayor the commune.  He was recognised as "grand chef" in 1974, but, due to a violent succession dispute with his relative Jean-Marie Vendégou, was not formally enthroned until later, on 7 July 1979.  He is also the incumbent mayor of the island commune, until 2014. The 2013 New York City mayoral election occurred on November 5, 2013, along with elections for comptroller, public advocate, borough presidents, and members of the New York City Council.  The incumbent Mayor of New York, Michael Bloomberg, a Republican-turned-Independent, was term-limited and thus unable to seek re-election to a fourth term in office. Michael Rubens "Mike" Bloomberg (born February 14, 1942) is an American businessman, author, politician, and philanthropist.  His net worth is estimated at US$ 53.4 billion, as of July 2017, ranking him as the 6th richest person in the United States and the 10th richest person in the world.  He has joined The Giving Pledge, whereby billionaires pledge to give away at least half of their wealth. The 2017 Albuquerque mayoral election is a nonpartisan election, to be held on October 3, 2017, to choose the next mayor of Albuquerque, New Mexico.  Richard J. Berry, the incumbent mayor, will not seek reelection.  This will be the first mayoral election in Albuquerque without an incumbent candidate in twenty years.  All candidates run on the same ballot.  If no candidate reaches 50% of the vote, a runoff election is held between the top two finishers. The 2011 Fort Worth mayoral election was held on May 14, 2011 to elect the next mayor of Fort Worth, Texas.  The incumbent mayor Mike Moncrief did not seek reelection after having served four terms as mayor of Fort Worth since 2003.  Republican Betsy Price won the election against Democrat Jim Lane and succeeded Moncrief on July 12, 2011. The Rochester Mayoral Election of 2013 took place on November 5, 2011 in the City of Rochester, New York, United States.  Democratic Mayor Thomas Richards, who first took office following Robert Duffy's resignation to take office of Lieutenant-Governor of New York in 2011, ran for reelection and was defeated in both the Democratic Primary and the general election by former City Council President Lovely A. Warren.  Green Party candidate Alex White also ran and received a notable 5% of the vote.  Considered a major upset victory, Lovely Warren defeated the incumbent mayor Richards in their party's primary against most major polling predictions.
Answer: 53.4 billion