Melbourne is notable as the host city for the 1956 Summer Olympic Games (the first Olympic Games held in the southern hemisphere and Oceania, with all previous games held in Europe and the United States), along with the 2006 Commonwealth Games. Melbourne is so far the southernmost city to host the games. The city is home to three major annual international sporting events: the Australian Open (one of the four Grand Slam tennis tournaments); the Melbourne Cup (horse racing); and the Australian Grand Prix (Formula One). Also, the Australian Masters golf tournament is held at Melbourne since 1979, having been co-sanctioned by the European Tour from 2006 to 2009. Melbourne was proclaimed the "World's Ultimate Sports City", in 2006, 2008 and 2010. The city is home to the National Sports Museum, which until 2003 was located outside the members pavilion at the Melbourne Cricket Ground. It reopened in 2008 in the Olympic Stand.

Answer this question, if possible (if impossible, reply "unanswerable"): In what three years was Melbourne proclaimed the "World's Ultimate Sports City"?
2006, 2008 and 2010