Year	Hours Per Week
1992	39.392
1993	37.8451
1994	37.5392
1995	38.1046
1996	38.0352
1997	38.1865
1998	38.8189
1999	37.1182
2000	36.9898
2001	36.7457
2002	36.8887
2003	36.6632
2004	36.563
2005	36.9764
2006	37.1298
2007	37.3938
2008	37.0773
2009	36.9964
2010	37.3608
2011	37.2097
2012	36.9902
2013	37.2885
2014	37.3358
2015	37.3214
2016	37.3465
2017	36.6673