Year	Percent
1999-01-01	2.1973100000000000
2000-01-01	2.1973100000000000
2001-01-01	2.4498500000000000
2002-01-01	4.4083400000000000
2003-01-01	7.5682700000000000
2004-01-01	8.6343300000000000
2005-01-01	5.7854100000000000
2006-01-01	3.8213800000000004
2007-01-01	4.4972300000000000
2008-01-01	1.0278700000000000
2009-01-01	1.1189200000000001
2010-01-01	1.0817000000000000
2011-01-01	1.1802500000000000
2012-01-01	1.2114300000000000
2013-01-01	1.0627400000000000