You're right. I mixed up my stats. Most of the new households come in these cities without owning a car.
Sources: http://sf.streetsblog.org/2014/08/15/car-free-households-are... https://ggwash.org/view/35905/88-of-new-dc-households-are-ca... http://www.betterinstitutions.com/blog/2013/07/almost-all-of...