Year	Hours Per Week
1970	44.8
1971	44.5
1972	42.5
1973	42.3
1974	41.5
1975	40
1976	40
1977	40
1978	40
1979	40
1980	40
1981	40
1982	40
1983	40
1984	40
1985	40
1986	40
1987	40
1988	40
2000	42.3188
2001	35.317
2002	40.2525
2003	38.8571
2004	40.944
2005	39.1792
2006	39.3805
2007	39.6406
2008	39.6358
2009	39.2801
2010	38.7292
2011	38.2618
2012	38.2712
2013	38.0124
2014	37.4514
2015	37.5222
2016	38.2909
2017	37.9342