<Li> Should there be a need for it, an occasional Saturday afternoon or night game, only in mid to late December, due to the Sports Broadcasting Act of 1961 . December Saturday games have been a part of the schedule every season since 1970, except for 2013 . </Li> <P> Since the 2006 season, the NFL has used a "flexible scheduling" system for the last seven weeks of the regular season when there is a Sunday night game . In 2014, that was expanded to include weeks 5--17 . Flex scheduling ensures quality matchups on Sunday nights and it allows for surprise teams to play in primetime . </P> <Table> <Tr> <Th_colspan="2"> Number of regular season games per team </Th> </Tr> <Tr> <Td> 1935--1936 </Td> <Td> 12 games </Td> </Tr> <Tr> <Td> 1937--1942, 1946 </Td> <Td> 11 games (12 weeks) </Td> </Tr> <Tr> <Td> 1943--1945 </Td> <Td> 10 games (12 weeks) </Td> </Tr> <Tr> <Td> 1947--1960 </Td> <Td> 12 games (variable weeks) </Td> </Tr> <Tr> <Td> 1961--1965, 1967 - 1977 </Td> <Td> 14 games (14 weeks) </Td> </Tr> <Tr> <Td> 1966 </Td> <Td> 14 games (15 weeks, odd number of teams) </Td> </Tr> <Tr> <Td> 1978--1981, 1983--1986, 1988--1989 </Td> <Td> 16 games (16 weeks) </Td> </Tr> <Tr> <Td> 1982 </Td> <Td> 9 games (17 weeks, strike) </Td> </Tr> <Tr> <Td> </Td> <Td> 15 games (16 weeks, strike) </Td> </Tr> <Tr> <Td> 1990--1992, 1994--2000, 2002--present </Td> <Td> 16 games (17 weeks) </Td> </Tr> <Tr> <Td> 1993 </Td> <Td> 16 games (18 weeks, additional bye week) </Td> </Tr> <Tr> <Td> 2001 </Td> <Td> 16 games (18 weeks, September 11 attacks) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Number of regular season games per team </Th> </Tr>

When did nfl switch to 16 game season
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