Of the billionaires whose representatives responded to Bloomberg, Alisher Usmanov gave the most, contributing $172 million of his $13 billion fortune. His charitable spending decreased 11 percent from the previous year, when 12 Russian billionaires participated in a Bloomberg survey, as his wealth ranking has slipped from No. 1 to No. 5 in the country.

Suleiman Kerimov donated $55 million, according to his charitable foundation’s 2014 annual report, or about 1.2 percent of his $4.7 billion in assets.

Potanin, worth an estimated $15.6 billion, contributed $31.3 million, his office said. In 2013, he became the first Russian to join the Giving Pledge.

Viktor Vekselberg and Alexey Mordashov, with fortunes of $13.9 billion and $14 billion, gave away $41 million and $32.9 million, respectively, according to their offices.

The country’s economic woes haven’t deterred Mordashov, he said in an interview in June.

“There’s been no chaotic consequences as a result of the crisis,” said Mordashov, whose charity spending rose 13 percent. “Liquidity isn’t bad and our debt is low.”

Oleg Deripaska’s foundation donated $27 million, according to data provided by his holding company. Vagit Alekperov, a major shareholder in oil producer OAO Lukoil, contributed $23 million, a 92 percent jump from the prior year, his office said. Brooklyn Nets owner Mikhail Prokhorov gave $19 million.

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