Year	Percent
1999-01-01	22.673000000000002
2000-01-01	31.296700000000000
2001-01-01	30.107900000000000
2002-01-01	32.788700000000000
2003-01-01	35.636400000000000
2004-01-01	34.233100000000000
2005-01-01	32.193300000000000
2006-01-01	39.850300000000000
2007-01-01	47.502600000000000
2008-01-01	44.499100000000000
2009-01-01	57.659300000000000
2010-01-01	57.930300000000000
2011-01-01	53.308600000000000
2012-01-01	60.048800000000000
2013-01-01	58.371700000000000
2014-01-01	58.272500000000000
2015-01-01	67.813600000000000
2016-01-01	72.033500000000000