Year	Hours per Week
2001-01-01	39.4
2002-01-01	40.3
2003-01-01	40.5
2004-01-01	40.0
2005-01-01	39.5
2006-01-01	39.9
2007-01-01	40.1
2008-01-01	39.6
2009-01-01	40.0
2010-01-01	38.6
2011-01-01	38.7
2012-01-01	39.0
2013-01-01	39.3
2014-01-01	40.2
2015-01-01	38.6
2016-01-01	39.4