Year	Percent
1999-01-01	7.77064351094464
2000-01-01	7.17845203513771
2001-01-01	5.22340211007227
2002-01-01	5.86952640710636
2003-01-01	5.97555561688774
2004-01-01	5.76213861312482
2005-01-01	4.79491779252943
2006-01-01	4.67159557789760
2007-01-01	4.49711583089861
2008-01-01	5.54367926325393
2009-01-01	7.98563956237932
2010-01-01	9.01990339492073
2011-01-01	9.84451834664413
2012-01-01	11.41665790977970
2013-01-01	12.15134181558130
2014-01-01	11.52882504776340