Year	Percent
1999-01-01	1.2070400000000000
2000-01-01	1.4978200000000002
2001-01-01	4.0356000000000000
2002-01-01	12.5802000000000000
2003-01-01	14.2190000000000010
2004-01-01	15.2066000000000000
2005-01-01	16.2809000000000000
2006-01-01	17.3928000000000000
2007-01-01	15.7626000000000000
2008-01-01	15.0361000000000000
2009-01-01	19.5890000000000020
2010-01-01	18.6709000000000000
2011-01-01	17.2950000000000000
2012-01-01	20.3220000000000000
2013-01-01	19.8748000000000000
2014-01-01	22.6506000000000000
2015-01-01	21.4067000000000000
2016-01-01	21.1348000000000000