Year	Hours Per Week
1996	40.1
1997	41.2
1998	43.1852
1999	43.3654
2000	43.2154
2001	43.7285
2002	43.6162
2003	43.1122
2004	41.8359
2005	42.1939
2006	42.2482
2007	41.553
2008	40.4027
2009	39.617
2010	39.0859
2011	39.2486
2012	39.1948
2013	39.0944
2014	39.2863
2015	39.2013
2016	39.2912
2017	38.9063