Year	Percent
1980-01-01	4.8810600000000000
1981-01-01	4.3123100000000000
1982-01-01	7.2440700000000000
1983-01-01	10.3757000000000000
1984-01-01	10.2764000000000000
1985-01-01	8.8381400000000000
1986-01-01	11.1923000000000000
1987-01-01	10.8251000000000000
1988-01-01	7.5941600000000005
1989-01-01	5.8781500000000000
1990-01-01	7.0937500000000000
1991-01-01	5.6576800000000000
1992-01-01	5.9761300000000000
1993-01-01	4.4001300000000000
1994-01-01	4.5952800000000010
1995-01-01	5.3720000000000010
1996-01-01	3.3234100000000000
1997-01-01	5.1274100000000000
1998-01-01	4.9340600000000000
1999-01-01	5.9045300000000000
2000-01-01	5.8476300000000005
2001-01-01	5.7781600000000000
2002-01-01	3.8802700000000000
2003-01-01	3.2086900000000003
2004-01-01	4.4632700000000000
2005-01-01	4.5363900000000000
2006-01-01	2.8894400000000000
2007-01-01	3.1243500000000000
2008-01-01	3.9380699999999997
2009-01-01	4.4306500000000000
2010-01-01	6.1277800000000004
2011-01-01	5.7106000000000000
2012-01-01	6.0547800000000000
2013-01-01	5.9787500000000000
2014-01-01	5.2855800000000000
2015-01-01	4.6279900000000005
2016-01-01	6.8445800000000006