Year	Percent
1999-01-01	1.2070400000000000
2000-01-01	1.4978200000000002
2001-01-01	4.0356000000000000
2002-01-01	13.5560000000000000
2003-01-01	15.1432000000000000
2004-01-01	16.7024000000000000
2005-01-01	17.6690000000000000
2006-01-01	19.3224000000000000
2007-01-01	17.5383000000000000
2008-01-01	16.7300000000000000
2009-01-01	20.9951000000000000
2010-01-01	19.3641000000000000
2011-01-01	17.2950000000000000
2012-01-01	20.3220000000000000
2013-01-01	19.8748000000000000
2014-01-01	22.6506000000000000
2015-01-01	22.5453000000000000
2016-01-01	22.2590000000000000