Year	Percent
1980-01-01	2.6303400000000003
1981-01-01	2.8833800000000000
1982-01-01	3.9790600000000000
1983-01-01	3.6595699999999995
1984-01-01	3.8412300000000004
1985-01-01	3.5860700000000000
1986-01-01	3.6730400000000003
1987-01-01	3.8168400000000000
1988-01-01	3.6884600000000000
1989-01-01	3.1067299999999998
1990-01-01	2.6735300000000000
1991-01-01	2.4188200000000000
1992-01-01	2.0937400000000000
1993-01-01	1.9160900000000000
1994-01-01	1.7225000000000000
1995-01-01	1.5445799999999998
1996-01-01	1.3143799999999999
1997-01-01	1.5430100000000000
1998-01-01	2.8793300000000000
1999-01-01	3.9238800000000005
2000-01-01	3.9335199999999997
2001-01-01	10.3168000000000000
2002-01-01	8.7119200000000000
2003-01-01	8.4913100000000000
2004-01-01	9.3603500000000000
2005-01-01	9.5495200000000000
2006-01-01	10.2477000000000000
2007-01-01	8.9345699999999990
2008-01-01	8.8171400000000000
2009-01-01	9.9819400000000000
2010-01-01	9.4498100000000010
2011-01-01	8.7142000000000000
2012-01-01	8.8503400000000000
2013-01-01	9.4847200000000000
2014-01-01	9.7875700000000000
2015-01-01	10.1494000000000000
2016-01-01	9.8873100000000010