Year	Percent
1996-01-01	4.1074500000000000
1997-01-01	3.8160700000000000
1998-01-01	3.6277300000000000
1999-01-01	3.9988000000000000
2000-01-01	4.3774200000000000
2001-01-01	3.1386100000000000
2002-01-01	4.3663099999999995
2003-01-01	4.5795400000000000
2004-01-01	6.9735600000000010
2005-01-01	3.5797800000000004
2006-01-01	3.4133000000000000
2007-01-01	3.5057400000000003
2008-01-01	2.8860099999999997
2009-01-01	2.8255100000000000
2010-01-01	2.6899400000000000
2011-01-01	2.4183600000000000
2012-01-01	2.6315400000000000
2013-01-01	2.3289200000000000
2014-01-01	1.9494000000000000
2015-01-01	2.1286099999999997
2016-01-01	2.0867600000000000