Year	Percent
1980-01-01	1.4000800000000000
1981-01-01	1.5340000000000000
1982-01-01	1.9771599999999998
1983-01-01	2.4843800000000000
1984-01-01	3.0256300000000000
1985-01-01	4.4866900000000000
1986-01-01	4.7794900000000000
1987-01-01	5.9794300000000010
1988-01-01	5.8723199999999990
1989-01-01	8.5133100000000000
1990-01-01	9.9068500000000000
1991-01-01	9.9230800000000000
1992-01-01	8.9736700000000000
1993-01-01	7.3918399999999990
1994-01-01	6.9656800000000000
1995-01-01	6.2237000000000000
1996-01-01	6.8168300000000000
1997-01-01	6.9436399999999990
1998-01-01	7.5782500000000000
1999-01-01	7.1358600000000010
2000-01-01	5.6521200000000000
2001-01-01	5.7072300000000000
2002-01-01	5.8584700000000000
2003-01-01	5.9047100000000000
2004-01-01	5.9584100000000000
2005-01-01	5.5150600000000000
2006-01-01	6.7382100000000005
2007-01-01	7.5996399999999990
2008-01-01	7.5343600000000000
2009-01-01	7.1017800000000010
2010-01-01	6.5930899999999990
2011-01-01	5.8712599999999995
2012-01-01	5.9815300000000000
2013-01-01	7.4950399999999995
2014-01-01	8.3528399999999990
2015-01-01	9.7935600000000010
2016-01-01	9.2766500000000000