Year	Hours per Week
2001-01-01	43.9
2002-01-01	43.7
2003-01-01	42.8
2004-01-01	46.4
2005-01-01	43.7
2006-01-01	43.9
2007-01-01	42.2
2008-01-01	43.3
2009-01-01	42.1
2010-01-01	38.4
2011-01-01	41.5
2012-01-01	42.0
2013-01-01	37.0
2014-01-01	35.2
2015-01-01	33.9
2016-01-01	33.0
2017-01-01	36.7