American business magnate Warren Buffett made around $37 million (approx Rs 230 crore at Wednesday's exchange rate) every day in 2013, according to Wealth-X. This figure makes him the billionaire who made the most money this year.
With a gain of $12.7 billion in 2013, Buffett's net worth at the end of the year stands at $59.1 billion. The notable philanthropist had a fortune of $46.4 billion at the beginning of the year.
However, Buffett is not the wealthiest billionaire on the top 10 list prepared by Wealth-X.
Microsoft chairman Bill Gates added $11.5 billion to his personal fortune in 2013, ending the year with assets totalling $72.6 billion. Gates is also the richest person on the list.
According to the report, the top 10 individuals collectively gained $101.8 billion in 2013, an average gain of $10.2 billion each. The combined wealth of these individuals stand at $347 billion in December this year, up from $245 billion in January 2013.
Besides, on an average, they made $29 million per day in 2013 and increased their wealth by 41.6%, outperforming the 24% returns seen in the S&P 500 this year.
Gates is followed by casino mogul Sheldon Adelson at the third spot, who raked in $11.4 billion in 2013 from his various properties in Las Vegas, Macau and Singapore. His personal net worth is estimated to be more than $35 billion in December from $23.9 billion in January.
Amazon founder and CEO Jeff Bezos became richer by $11.3 billion to take his total fortune to $34.4 billion.
Besides, Facebook founder Mark Zuckerberg gained $10.5 billion taking his wealth to $24.7 billion.
The report said that Masayoshi Son, head of SoftBank Corp, added $10.3 billion to his fortune.
Google's founders Larry Page and Sergey Brin have added $9.3 billion each to their personal wealth. Brin's net worth stood at $30 billion, while that of Page was at $29.9 billion.
Hong Kong's business tycoon Lui Chee Woo made a fortune of $8.3 billion in 2013, while private equity investor Carl Icahn gained $7.3 billion in the year.
As per the report, the valuations are for the period between January 1 and December 11, 2013.