Year	Hours per Week
2001-01-01	40.1
2002-01-01	40.5
2003-01-01	41.3
2004-01-01	40.1
2005-01-01	40.8
2006-01-01	40.6
2007-01-01	40.6
2008-01-01	41.4
2009-01-01	44.5
2010-01-01	41.2
2011-01-01	42.0
2012-01-01	42.7
2013-01-01	41.8
2014-01-01	41.2
2015-01-01	41.2
2016-01-01	40.7