Year	Percent
1980-01-01	1.8526700000000000
1981-01-01	2.3533500000000000
1982-01-01	3.8294599999999996
1983-01-01	3.8681000000000000
1984-01-01	4.4531300000000010
1985-01-01	6.8784600000000005
1986-01-01	7.2904700000000000
1987-01-01	18.1266000000000000
1988-01-01	13.4656000000000000
1989-01-01	12.3191000000000000
1990-01-01	14.5057000000000000
1991-01-01	13.7848000000000000
1992-01-01	11.5838000000000000
1993-01-01	5.2890300000000000
1994-01-01	4.7677800000000000
1995-01-01	5.3434700000000000
1996-01-01	5.8993000000000000
1997-01-01	7.2387600000000010
1998-01-01	9.0449399999999990
1999-01-01	8.6252200000000000
2000-01-01	10.1253000000000000
2001-01-01	11.6940000000000000
2002-01-01	11.2055000000000000
2003-01-01	8.1789300000000010
2004-01-01	8.6476899999999990
2005-01-01	5.1797400000000000
2006-01-01	5.3023900000000000
2007-01-01	6.4035699999999990
2008-01-01	5.1565400000000010
2009-01-01	7.5898300000000000
2010-01-01	9.1635800000000000
2011-01-01	11.4144000000000000
2012-01-01	12.7448000000000000
2013-01-01	12.1808000000000000
2014-01-01	9.5289000000000000
2015-01-01	11.0035000000000000
2016-01-01	7.4496699999999990