Year	Percent
1999-01-01	2.4937300000000000
2000-01-01	1.4548600000000000
2001-01-01	2.2455900000000000
2002-01-01	1.8434900000000000
2003-01-01	1.8988500000000000
2004-01-01	1.3320299999999998
2005-01-01	1.0798299999999998
2006-01-01	1.2770400000000000
2007-01-01	0.8282149999999999
2008-01-01	1.3870900000000000
2009-01-01	2.6169599999999997
2010-01-01	1.6722000000000000
2011-01-01	1.8367799999999999
2012-01-01	1.7157200000000001
2013-01-01	1.7060500000000000
2014-01-01	1.7925000000000000
2015-01-01	2.0316700000000000