Year	Hours per Week
2001-01-01	40.9
2002-01-01	40.6
2003-01-01	40.2
2004-01-01	35.0
2005-01-01	40.4
2006-01-01	38.1
2007-01-01	33.9
2008-01-01	37.3
2009-01-01	37.5
2010-01-01	37.6
2011-01-01	37.8
2012-01-01	38.4