[kach22i]

http://www.nytimes.com/2008/05/01/nyregion/01cars.html?_r=2&scp=1&sq=What%20would%20you%20drive%20if%20the%20taxpaye rs%20paid&st=cse&oref=slogin&oref=slogin

Congressional records show that about 125 members of the House make use of the benefit

http://en.wikipedia.org/wiki/United_States_House_of_Representatives

The total number of representatives is currently fixed at 435

435/125 x 100 = 28.7%