At the end of the 1937–38 season, Fredrikstad were the first club to be crowned champions in the history of the championship. Rosenborg have won 26 titles, the most of any club. Fredrikstad are second with nine. Rosenborg dominated during the 1990s and 2000s, winning 13 consecutive league titles from 1992 to 2004. Fredrikstad secured all their titles before the league changed its format to a one-group top division in 1963. Third-most title winning team Viking dominated in the 1970s when they won five of their eight titles. Rosenborg and Viking are the only teams to have won the league title three or more consecutive times. All the clubs which have ever been crowned champions are still in existence today and all take part in the top six tiers of the Norwegian football league system - the football pyramid.