Year	Percent
1980-01-01	1.3160200000000000
1981-01-01	1.1803600000000000
1982-01-01	1.2147800000000000
1983-01-01	1.1856100000000000
1984-01-01	1.2399200000000001
1985-01-01	1.4154200000000001
1986-01-01	1.5221500000000000
1987-01-01	1.3357400000000000
1988-01-01	0.9509139999999999
1989-01-01	0.6021090000000000
1990-01-01	0.5253580000000000
1991-01-01	0.5494010000000000
1992-01-01	0.1328540000000000
1993-01-01	1.7836100000000000
1994-01-01	3.1714200000000000
1995-01-01	3.7060100000000000
1996-01-01	6.3216300000000000
1997-01-01	9.5418899999999990
1998-01-01	12.1759000000000000
1999-01-01	11.4549000000000000
2000-01-01	11.0470000000000000
2001-01-01	11.0369000000000000
2002-01-01	11.8961000000000000
2003-01-01	12.6700000000000000
2004-01-01	10.7022000000000000
2005-01-01	8.9712600000000010
2006-01-01	8.0872700000000000
2007-01-01	6.3139000000000000
2008-01-01	5.2173600000000000
2009-01-01	6.5410300000000000
2010-01-01	6.4235400000000000
2011-01-01	6.1980400000000000
2012-01-01	6.1396100000000000
2013-01-01	6.5560500000000000
2014-01-01	6.4749300000000005
2015-01-01	6.9426300000000000
2016-01-01	6.3745800000000000