When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today there are less than one-quarter that many.

在20世纪50年代末汽车影院最受欢迎的时候，美国大约有4000家汽车影院，但如今，这个数字还不到当时的四分之一。