Year	Hours Per Week
1987	46.5
1988	46.3
1989	45.9
1990	46.5
1991	45.6
1992	46.8
1993	47
1994	46.9
1995	46.5
1996	46.9
1997	46.9
1998	46.6
1999	46.8
2000	46.6
2001	47
2002	47
2003	47
2004	45.6
2005	45.1
2006	45.1
2007	46.5
2008	46.88
2010	45.1327
2011	45.3285
2012	43.882
2013	42.6952
2014	42.5161
2015	42.9768
2016	43.874
2017	43.2446