Year	Percent
1999-01-01	2.1923600000000000
2000-01-01	2.2396599999999998
2001-01-01	3.6003100000000000
2002-01-01	7.9130600000000010
2003-01-01	13.5989000000000000
2004-01-01	16.6863000000000000
2005-01-01	18.3454000000000000
2006-01-01	23.3630000000000030
2007-01-01	25.5833000000000000
2008-01-01	15.7124000000000000
2009-01-01	23.6416000000000000
2010-01-01	20.2499000000000000
2011-01-01	14.9029000000000000
2012-01-01	15.0544000000000000
2013-01-01	22.4840000000000000
2014-01-01	17.4991000000000000
2015-01-01	22.9260000000000000
2016-01-01	22.3009000000000000