Year	Hours Per Week
1997	42.2662
1998	42.1885
1999	41.9116
2000	41.1173
2001	40.727
2002	40.7716
2003	40.2385
2004	40.3583
2005	40.2233
2006	40.3222
2007	40.0439
2008	39.5332
2009	38.0325
2010	38.8926
2011	39.0443
2012	38.741
2013	38.663
2014	38.3021
2015	38.1453
2016	38.5725
2017	38.7358