Year	Percent
1999-01-01	7.8322199999999995
2000-01-01	6.4568800000000000
2001-01-01	5.6875900000000000
2002-01-01	4.0878400000000000
2003-01-01	3.1304100000000000
2004-01-01	3.1759100000000000
2005-01-01	3.3534800000000002
2006-01-01	3.1541300000000000
2007-01-01	2.4807500000000000
2008-01-01	2.4832400000000003
2009-01-01	2.8823000000000000
2010-01-01	4.1843500000000000
2011-01-01	4.6757400000000000
2012-01-01	7.2642700000000000
2013-01-01	7.0873200000000000
2014-01-01	7.9851100000000010
2015-01-01	6.8430600000000000
2016-01-01	7.3374300000000000