Australian rules football and cricket are the most popular sports in Melbourne. It is considered the spiritual home of the two sports in Australia. The first official Test cricket match was played at the Melbourne Cricket Ground in March 1877. The origins of Australian rules football can be traced to matches played next to the MCG in 1858. The Australian Football League is headquartered at Docklands Stadium. Nine of the League's teams are based in the Melbourne metropolitan area: Carlton, Collingwood, Essendon, Hawthorn, Melbourne, North Melbourne, Richmond, St Kilda, and Western Bulldogs. Up to five AFL matches are played each week in Melbourne, attracting an average 40,000 people per game. Additionally, the city annually hosts the AFL Grand Final.
Try to answer this question if possible (otherwise reply "unanswerable"): How many of the Australian Football League's teams are based in the Melbourne metropolitan area?
Nine