Year	Percent
2001-01-01	41.94
2002-01-01	32.96
2003-01-01	38.10
2004-01-01	39.92
2005-01-01	45.79
2006-01-01	47.43
2007-01-01	43.92
2008-01-01	33.83
2009-01-01	42.45
2010-01-01	45.05
2011-01-01	42.05
2012-01-01	45.85
2013-01-01	50.75
2014-01-01	57.81
2015-01-01	42.88
2016-01-01	40.73