In 2003 individuals gave $179.4 Billion to charities. That is only up 0.2% from 2002, after inflation.
$1,620 is the average annual amount that contributig households give to charities; which represents about 3% of their income.
$1800 VS. $1,310 is the amount contributed by househols that itemize versus households that take the standard deduction. Tax deductions do play a parts in giving.