Since mid-2007, agencies have been able to use the GTFS format to share route and schedule data. The GTFS-Data-Warehouse has documented the release date of each agency’s data, shown here scaled according to the passgenger-miles served  in 2010 when transit providers served 53.6B passenger-miles nationally. About one fourth of the agencies in the U.S. have open  route and schedule data, representing about 85 percent of the total passenger-miles served.