Year	Hours per Week
2001-01-01	42.2
2002-01-01	42.5
2003-01-01	42.0
2004-01-01	42.7
2005-01-01	42.5
2006-01-01	42.3
2007-01-01	41.6
2008-01-01	41.1
2009-01-01	42.2
2010-01-01	38.8
2011-01-01	41.1
2012-01-01	42.7
2013-01-01	41.8
2014-01-01	45.0
2015-01-01	43.3
2016-01-01	43.3