Year	Percent
1980-01-01	4.2604500000000000
1981-01-01	4.0411500000000000
1982-01-01	5.1308500000000000
1983-01-01	4.6566500000000000
1984-01-01	4.1064900000000000
1985-01-01	5.0370599999999990
1986-01-01	5.4979800000000000
1987-01-01	5.5851800000000000
1988-01-01	4.1373800000000000
1989-01-01	4.1934900000000000
1990-01-01	3.7487199999999996
1991-01-01	3.3897199999999996
1992-01-01	5.7148300000000000
1993-01-01	6.5428600000000000
1994-01-01	6.4791800000000000
1995-01-01	6.6871800000000010
1996-01-01	6.4481100000000000
1997-01-01	6.9929100000000000
1998-01-01	7.8392899999999990
1999-01-01	7.9472400000000000
2000-01-01	9.0516899999999990
2001-01-01	9.2507900000000000
2002-01-01	9.7805900000000000
2003-01-01	9.6690500000000000
2004-01-01	10.9842000000000000
2005-01-01	14.4819000000000000
2006-01-01	13.0539000000000000
2007-01-01	13.0984000000000000
2008-01-01	12.8968000000000000
2009-01-01	12.3291000000000000
2010-01-01	10.9620000000000000
2011-01-01	10.9686000000000000
2012-01-01	13.1449000000000000
2013-01-01	11.8035000000000000
2014-01-01	9.7452000000000000
2015-01-01	9.3084700000000000
2016-01-01	9.1861500000000000