Year	Percent
1999-01-01	2.3675200000000003
2000-01-01	2.2482400000000000
2001-01-01	2.2677099999999997
2002-01-01	2.3002200000000000
2003-01-01	2.3613800000000000
2004-01-01	2.3145100000000000
2005-01-01	2.2510700000000000
2006-01-01	2.2216099999999996
2007-01-01	2.1768300000000000
2008-01-01	2.1902100000000000
2009-01-01	2.2366700000000000
2010-01-01	2.1846900000000002
2011-01-01	2.2119600000000000
2012-01-01	2.2527700000000000
2013-01-01	2.2680200000000000
2014-01-01	2.2019900000000003
2015-01-01	2.1386600000000000