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wiki says 10% americans have severe disability ada says only 1 in 25 parking spaces ada accessible ?

" Accessible parking spaces for cars have at least a 60-inch-wide access aisle located adjacent to the designated parking space. The access aisle is just
wide enough to permit a person using a wheelchair to enter or exit the car. These parking spaces are identified with a sign and lolpaces for cars except for three features needed for vans:

a wider access aisle (96") to accommodate a wheelchair lift "

http://www.ada.gov/restribr.htm

http://en.m.wikipedia.org/wiki/Americans_with_disabilities