<P> The 2000 NFL season was the 81st regular season of the National Football League . The season ended with Super Bowl XXXV when the Baltimore Ravens defeated the New York Giants 34 - 7 at the Raymond James Stadium . </P> <P> Week 1 of the season reverted to Labor Day weekend in 2000 . It would be the last NFL season to date to start Labor Day weekend . It would also be the last time until 2015 that CBS televised the late games in Week 1, because both Week 1 of the NFL season and CBS's coverage of the U.S. Open tennis finals would take place on the same day beginning next season . </P> <Ul> <Li> In order to cut down on group celebrations, unsportsmanlike conduct penalties and fines will be assessed for celebrations by two or more players . </Li> <Li> Anyone wearing an eligible number (1--49 and 80--89) can play at quarterback without having to first report to the referee before a play . <Ul> <Li> This rule change resulted in the increase of trick plays teams can employ on offense . </Li> </Ul> </Li> <Li> The "Bert Emanuel" rule was implemented, stating that when making a catch and falling to the ground, the ball is allowed to touch the ground and still be considered a catch if the player maintains clear control of the ball . </Li> </Ul> <Li> In order to cut down on group celebrations, unsportsmanlike conduct penalties and fines will be assessed for celebrations by two or more players . </Li>

How many nfl teams were there in 2000