Just 17 out of the 535 members of Congress released their most recent tax forms or provided some similar documentation of their tax liabilities in response to requests from McClatchy over the last three months. Another 19 replied that they wouldn’t release the information, and the remainder never responded to the query.

http://www.mcclatchydc.com/2012/07/18/156632/most-members-of-congress-keep.html