Year	Hours per Week
2001-01-01	42.3
2002-01-01	40.6
2003-01-01	42.0
2004-01-01	44.7
2005-01-01	43.5
2006-01-01	42.0
2007-01-01	42.9
2008-01-01	43.6
2009-01-01	42.4
2010-01-01	43.6
2011-01-01	42.1
2012-01-01	42.4
2013-01-01	39.1
2014-01-01	39.7
2015-01-01	39.0
2016-01-01	37.2