Year	Hours per Week
2001-01-01	32.6
2002-01-01	33.7
2003-01-01	34.6
2004-01-01	35.9
2005-01-01	39.4
2006-01-01	38.1
2007-01-01	34.3
2008-01-01	31.9
2009-01-01	33.0
2010-01-01	38.3
2011-01-01	38.8
2012-01-01	36.2
2013-01-01	34.0
2014-01-01	32.0
2015-01-01	34.3
2016-01-01	38.6