Year	Hours per Week
2001-01-01	36.6
2002-01-01	40.0
2003-01-01	40.9
2004-01-01	39.1
2005-01-01	36.4
2006-01-01	37.1
2007-01-01	38.6
2008-01-01	37.8
2009-01-01	38.4
2010-01-01	38.8
2011-01-01	38.4
2012-01-01	39.0