Year	Hours Per Week
1998	42.1112
1999	42.204
2000	41.696
2001	41.1162
2002	40.8821
2003	40.6231
2004	40.8087
2005	41.1262
2006	40.2579
2007	40.4077
2008	39.9629
2009	39.3739
2010	39.6205
2011	39.5796
2012	39.5892
2013	39.6006
2014	39.0182
2015	38.9327
2016	38.8977
2017	38.5389