Year	Hours per Week
2001-01-01	40.4
2002-01-01	41.0
2003-01-01	41.3
2004-01-01	42.4
2005-01-01	42.5
2006-01-01	41.2
2007-01-01	41.8
2008-01-01	41.8
2009-01-01	41.2
2010-01-01	40.7
2011-01-01	40.8
2012-01-01	42.6
2013-01-01	42.7
2014-01-01	44.3
2015-01-01	43.3
2016-01-01	42.6