Year	Percent
1999-01-01	1.9797700000000000
2000-01-01	2.8584900000000000
2001-01-01	2.6223099999999997
2002-01-01	2.3294300000000000
2003-01-01	1.5232200000000000
2004-01-01	1.7587500000000000
2005-01-01	1.1268400000000000
2006-01-01	1.4417600000000000
2007-01-01	1.7344500000000000
2008-01-01	1.7446200000000000
2009-01-01	1.7758900000000002
2010-01-01	1.9391599999999998
2011-01-01	2.7424800000000000
2012-01-01	3.0553400000000000
2013-01-01	2.4684700000000000
2014-01-01	3.4375400000000003
2015-01-01	3.9175699999999996
2016-01-01	3.5643900000000000