<P> The largest industry in the Greater Toronto Area is the financial services in the province, accounting for an estimated 25% of the region's GDP . Notably, the five largest banks in Canada all have their operational headquarters in Toronto's Financial District . Toronto is also home to the headquarters of the Toronto Stock Exchange and the Standard and Poor TSX Composite Index and offices of the TSX Venture Exchange . The TMX Group, the owners and operators of TSX Exchanges as well as the Montreal Exchange, are also headquartered in Toronto . The TSX and the TSX Venture Exchange represent 3,369 companies, including more than half of the world's publicly traded mining companies . </P> <P> Markham also attracted the highest concentration of high tech companies in Canada, and because of it, has positioned itself as Canada's High - Tech Capital . The Greater Toronto Area is the second largest automotive centre in North America (after Detroit). Currently, General Motors, Ford and Chrysler run six assembly plants in the area, with Honda and Toyota having assembly plants just outside the GTA . General Motors, Ford, Honda, KIA, Mazda, Suzuki, Nissan, Volkswagen, Toyota, Hyundai, Aston Martin, Jaguar, Land Rover, Subaru, Volvo, BMW, and Mitsubishi have chosen the Greater Toronto Area for their Canadian headquarters . Magna International, the world's most diversified car supplier, also has its headquarters in Aurora . The automobile industry within the region accounts for roughly 10% of the region's GDP . </P> <P> While it was once the most dominant industry for residents in the Greater Toronto Area, agriculture now occupies a small percentage of the population, but still a large part of land in the surrounding four regional municipalities . Census data from 2006 has shown there are 3,707 census farms in the GTA, down 4.2% from 2001 and covering 274,363 hectares (677,970 acres). Almost every community in the GTA is currently experiencing a decrease in the acreage of farmland, with Mississauga seeing the most significant . The only communities in the GTA which are experiencing a growth in the acreage of farmland are Aurora, Georgina, Newmarket, Oshawa, Richmond Hill and Scugog, with Markham experiencing neither any growth nor decline . Most of the GTA's farmland is in Durham Region, with 55% of their total land area being farmland . This is followed by York Region with 41% of their lands being farm land, Peel Region with 34%, and Halton Region with 41% . Toronto's remaining farmland is completely within Rouge Park in the Rouge Valley . The average size of the farm in the GTA (183 acres (74 ha)) is much lower than the farms in the rest of Ontario (averaging 233 acres (0.94 km)). This has been attributed to the shift of farm types in the GTA from the traditional livestock and cash crop farms (requiring an extensive land base), towards more intensive enterprises including greenhouse, floriculture, nursery, vegetable, fruit, sheep and goats . </P> <P> The most numerous farms types in the GTA are miscellaneous specialty farms (including horse and pony, sheep and lamb, and other livestock specialty), followed by cattle, grain and oilseed, dairy and field crop farms . Although the output of dairy production has dropped with farms from within the GTA, dairy has remained the most productive sector in the agricultural industry by annual gross farm receipts . Despite the decreased amount of farmland around the region, farm capital value increased from $5.2 billion in 1996 to $6.1 billion in 2001, making the average farm capital value in the GTA continued to be the highest in the province . </P>

Is mississauga part of the greater toronto area