"Between 2000 and 2012, the city has seen a net increase of 11,139 households, and 88 percent of them have been car-free."

http://sf.streetsblog.org/2014/08/15/car-free-households-are...

"Census: 95% of New SF Commuters Since 2006 Don’t Drive Solo"

http://sf.streetsblog.org/2015/09/25/census-95-of-new-sf-com...