Year	Hours Per Week
1997	43.6518
1998	43.7632
1999	44.0562
2000	43.3502
2001	41.5818
2002	41.5583
2003	41.7176
2004	42.3242
2005	41.9707
2006	41.6879
2007	41.5041
2008	41.5157
2009	40.7436
2010	40.6964
2011	40.5314
2012	40.1772
2013	39.5404
2014	39.4153
2015	39.2289
2016	39.4937
2017	39.1702