Year	Hours Per Week
1987	34.6
1988	36.1
1989	35.6
1990	35.8
1991	35.6
1992	35.4
1993	35.6
1994	35.9
1995	35.9
1996	35.7
1997	35.7
1998	35.5
1999	35.6
2000	35.5
2001	35.1
2002	34.9
2003	34.6
2004	34.73731
2005	34.67213
2006	34.56716
2007	34.57998
2008	34.5023
2009	33.88103
2010	34.09036
2011	34.02055
2012	33.96452
2013	33.87363
2014	33.66816
2015	33.60446
2016	33.35