Year	Hours Per Week
1987	36.9
1988	37.4
1989	37.8
1990	37.6
1991	36.8
1992	36.2
1993	36.5
1994	36.9
1995	36.7
1996	36.9
1997	37.1
1998	36.9
1999	37
2000	37.2
2001	36.7
2002	36.4
2003	35.9
2004	36.2
2005	36.4
2006	36.2
2007	36.4
2008	36.1
2009	35.3
2010	35.5
2011	35.7
2012	35.9
2013	35.7
2014	35.3
2015	35.6
2016	32.6
2017	32.4