The dominant mode of transportation in New York City is rail. Only 6% of shopping trips in Manhattan's Central Business District involve the use of a car. The city's public transportation network is the most extensive and among the oldest in North America. Responsibility for managing the various components of the system falls to several government agencies. The largest and most important is the Metropolitan Transportation Authority (MTA), a public benefit corporation in the state of New York, which runs two of the city's three rapid transit systems, most of its buses, and two of its three commuter rail networks. Ridership in the city increased 36% to 2.2 billion annual riders from 1995 to 2005, far outpacing population growth.