Year	Percent
1976-01-01	0.9639940000000000
1977-01-01	1.2033300000000000
1978-01-01	1.6818700000000000
1979-01-01	1.6010200000000000
1980-01-01	2.1121800000000000
1981-01-01	3.8983700000000000
1982-01-01	7.8796899999999990
1983-01-01	9.3780200000000000
1984-01-01	7.1704100000000000
1985-01-01	6.0344400000000000
1986-01-01	7.5842300000000010
1987-01-01	6.7472400000000000
1988-01-01	7.8554900000000000
1989-01-01	7.1783899999999990
1990-01-01	7.1783899999999990
1991-01-01	16.4251000000000000
1992-01-01	10.4325000000000000
1993-01-01	8.0462200000000000
1994-01-01	5.4575200000000000
1995-01-01	4.1337100000000000
1996-01-01	3.7283500000000000
1997-01-01	3.8716600000000000
1998-01-01	4.5826300000000000
1999-01-01	4.1546600000000000
2000-01-01	3.2537900000000000
2001-01-01	5.5509699999999995
2002-01-01	7.7004600000000005
2003-01-01	7.5328600000000000
2004-01-01	6.8686700000000000
2005-01-01	6.3786500000000000
2006-01-01	6.6943000000000000
2007-01-01	6.6296100000000004
2008-01-01	5.8981000000000000
2009-01-01	7.0775700000000000
2010-01-01	5.1111900000000010
2011-01-01	3.6252100000000000
2012-01-01	3.0650100000000000
2013-01-01	2.6557000000000000
2014-01-01	2.4538599999999997
2015-01-01	3.1413800000000000
2016-01-01	3.5223400000000002