early 1990s. This assistance resulted in a significant adoption of natural gas transit buses as well. The NGV market started to decline after 1995, eventually reaching today's vehicle population of about 12,000. This figure includes 150 urban transit buses, 45 school buses, 9,450 light-duty cars and trucks, and 2,400 forklifts and ice-resurfacers. The total fuel use in all NGV markets in Canada was 1.9 petajoules (PJs) in 2007 (or 54.6 million litres of gasoline litres equivalent), down from 2.6 PJs in 1997. Public CNG refueling stations have declined in numbers from 134 in 1997 to 72 today. There are 22 in British Columbia, 12 in Alberta, 10 in Saskatchewan, 27 in Ontario, and 1 in Québec. There are only 12 private fleet stations. United States As of December 2009, the U.S. had a fleet of 114,270 compressed natural gas (CNG) vehicles, 147,030 vehicles running on liquefied petroleum gas (LPG), and 3,176 vehicles running on liquefied natural gas (LNG). The NGV fleet is made up mostly of transit buses, but there are also some government fleet cars and vans, as well as an increasing number of corporate trucks replacing diesel versions, most notably Waste Management, Inc and UPS trucks. As of 12-Dec-2013, Waste Management has a fleet of 2000 CNG Collection trucks; as of 12-Dec-2013, UPS has 2700 alternative fuel vehicles. As of February 2011, there were 873 CNG refueling sites, 2,589 LPG sites, and 40 LNG sites, led by California with 215 CNG refueling stations in operation, 228 LPG sites and 32 LNG sites. The number of refueling stations includes public and private sites; not all are available to the public. As of December 2010, the U.S. ranked sixth in the world in terms of number of NGV stations. Currently, there are 160,000 NGVs operating in the country. Mexico The natural gas vehicle market is limited to fleet vehicles and other public use vehicles like minibuses in larger cities. However, the state-owned bus company RTP Of Mexico City has purchased 30 Hyundai Super Aero City CNG-Propelled buses to integrate with the existing fleet as well as to introduce new routes within the city. South America Overview CNG vehicles are common in South America, with a 35% share of the worldwide NGV fleet, where these vehicles are mainly used as taxicabs in main cities of Argentina and Brazil. Normally, standard gasoline vehicles are retrofitted in specialized shops, which involve installing the