Wait a sec. If the gun ban "worked", shouldn't that number be -zero-????
The number isn't zero, because DC's law has a sort of "grandfather cluse." If you registered your gun prior to a certain date (1978, I believe), you are allowed to keep it. Otherwise, you are out of luck. Of course, as time goes on, the relatively small number of "grandfathered" gun owners becomes less and less. It will eventually dwindle to zero; it's just not there yet.