Or can you?
"Berkshire Hathaway reported today that its net worth fell in 2008 by $11.5 billion, a decline reducing its per-share book value by 9.6%. That was Berkshire's worst result in the 44 years that Chairman Warren Buffett has run the company and, in fact, only the second decline in that period. The other drop was 6.2% in 2001, a year hurt by 9/11 and other problems in Berkshire's insurance operations."
So, in a year the market was down 50%, Buffett lost only 9.6%, and that's the worst he's ever done!