Year	Percent
2002-01-01	30.17
2003-01-01	32.53
2004-01-01	33.40
2005-01-01	33.87
2006-01-01	36.15
2007-01-01	37.89
2008-01-01	38.48
2009-01-01	38.14
2010-01-01	39.67
2011-01-01	41.88
2012-01-01	50.16
2013-01-01	53.73
2014-01-01	58.03
2015-01-01	60.80
2016-01-01	63.16