Year	Percent
1985-01-01	3.6298800000000004
1986-01-01	5.0391400000000000
1987-01-01	6.8550600000000010
1988-01-01	4.6002300000000010
1989-01-01	2.2201800000000000
1990-01-01	3.1699300000000000
1991-01-01	5.2817200000000000
1992-01-01	6.7114199999999995
1993-01-01	10.5924000000000000
1994-01-01	13.4769000000000000
1995-01-01	12.8984000000000000
1996-01-01	13.2105000000000000
1997-01-01	13.3807000000000000
1998-01-01	17.1191000000000000
1999-01-01	20.1233000000000000
2000-01-01	19.3097000000000000
2001-01-01	16.8083000000000000
2002-01-01	9.5827500000000000
2003-01-01	4.0023800000000005
2004-01-01	4.5104200000000000
2005-01-01	4.7282800000000010
2006-01-01	4.7095300000000000
2007-01-01	4.4194100000000000
2008-01-01	3.4234900000000000
2009-01-01	2.5778800000000000
2010-01-01	1.9688299999999999
2011-01-01	1.7742300000000000
2012-01-01	2.6436000000000000
2013-01-01	3.7404400000000000
2014-01-01	4.3927400000000000
2015-01-01	4.6088200000000000
2016-01-01	5.2747800000000010