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Liverpool's longest-established rivalry is with fellow Liverpool team Everton, against whom they contest the Merseyside derby. The rivalry stems from Liverpool's formation and the dispute with Everton officials and the then owners of Anfield. The Merseyside derby is one of the few local derbies which do not enforce fan segregation, and hence has been known as the "friendly derby". Since the mid-1980s, the rivalry has intensified both on and off the field and, since the inception of the Premier League in 1992, the Merseyside derby has had more players sent off than any other Premier League game. It has been referred to as "the most ill-disciplined and explosive fixture in the Premier League". In terms of support within the city, the number of Liverpool fans outweighs Everton supporters by a ratio of 2:1.