Year	Percent
1998-01-01	2.2351600000000000
1999-01-01	1.9831599999999998
2000-01-01	2.1445200000000000
2001-01-01	2.8757200000000003
2002-01-01	3.2760800000000000
2003-01-01	3.7717300000000002
2004-01-01	3.8540400000000004
2005-01-01	4.4637500000000000
2006-01-01	5.8299100000000000
2007-01-01	10.3236000000000000
2008-01-01	10.9010000000000000
2009-01-01	8.7600900000000000
2010-01-01	8.8969899999999990
2011-01-01	9.5913600000000000
2012-01-01	9.5572699999999990
2013-01-01	9.8951500000000000
2014-01-01	10.2591000000000000
2015-01-01	11.3654000000000000
2016-01-01	12.0169000000000000