What is the minimum annual withdrawal from a RRIF?

Do you know what is the minimum annual withdrawal from a RRIF? As per the Federal 2008 Economic and Fiscal Statement, the minimum annual withdrawal from a Registered Retirement Income Fund (RRIF) was reduced, on a one-time basis, by 25% for 2008 withdrawals.  The legislation for this was included in Bill C-10, which received Royal Assent on March 12, 2009.  For those taxpayers who had already withdrawn more than the reduced minimum amount, the excess (up to the original minimum amount) was allowed as a recontribution to an RRSP or RRIF, and could be deducted on the 2008 tax return.  The recontribution was required to be made by April 14, 2009.