The Fiji national rugby union team represents Fiji in men's international rugby union contests every four years at the Rugby World Cup, and their best performances were the 1987 and 2007 tournaments when they defeated Argentina and Wales individually to reach the quarterfinals. Fiji also regularly plays test matches during the June and November test windows. Fiji also plays in the Pacific Tri-Nations, and has won the most Pacific Tri-Nations Championships of the three contributing teams. Fiji is one of the few countries where rugby union is the main sport. There are roughly 80,000 registered players from a total population of around 950,000. One obstacle for Fiji is simply getting their rugby players to play for the national team, as many have contracts in Europe or with Super Rugby teams where the money is far more worthwhile.