Year	Percent
1996-01-01	2.1768500000000000
1997-01-01	2.4819100000000000
1998-01-01	1.8037299999999998
1999-01-01	3.2271400000000003
2000-01-01	3.9047000000000000
2001-01-01	4.1912100000000000
2002-01-01	4.1912100000000000
2003-01-01	4.1912100000000000
2004-01-01	5.2512800000000000
2005-01-01	4.0385300000000010
2006-01-01	5.8720400000000000
2007-01-01	6.4885900000000000
2008-01-01	5.0685100000000000
2009-01-01	5.5938500000000000
2010-01-01	1.2943200000000001
2011-01-01	7.9711600000000000
2012-01-01	5.1566400000000000
2013-01-01	5.1888400000000000
2014-01-01	2.0208000000000000
2015-01-01	5.7151700000000000
2016-01-01	3.7778300000000002