I found this staggering though it is accurate. It's less surprising (though no less accurate) when you consider how the numbers skew by borough:
"Ownership is lowest in Manhattan, where only 22 percent of households own a car, while ownership is highest in Staten Island where cars are owned by 83 percent of all households. Queens (62 percent) is also above the city average, while the Bronx (40 percent) and Brooklyn (44 percent) look more like the city as a whole."