Year	Percent
1980-01-01	0.8709030000000001
1981-01-01	0.8939500000000000
1982-01-01	0.9521090000000000
1983-01-01	1.1128100000000000
1984-01-01	1.1649600000000000
1985-01-01	3.3626199999999997
1986-01-01	3.0762000000000000
1987-01-01	2.8805000000000000
1988-01-01	2.6418600000000000
1989-01-01	2.3213200000000000
1990-01-01	1.5976299999999999
1991-01-01	1.1050000000000000
1992-01-01	1.2458200000000001
1993-01-01	3.5295900000000002
1994-01-01	4.9007700000000000
1995-01-01	5.0188000000000000
1996-01-01	7.2795100000000000
1997-01-01	9.6465300000000000
1998-01-01	13.2588000000000000
1999-01-01	10.9708000000000000
2000-01-01	10.2062000000000000
2001-01-01	8.5625700000000000
2002-01-01	7.5521400000000000
2003-01-01	6.0224800000000010
2004-01-01	5.3346500000000000
2005-01-01	5.4334100000000000
2006-01-01	5.0366400000000000
2007-01-01	3.4739900000000000
2008-01-01	3.1814100000000000
2009-01-01	2.7517000000000000
2010-01-01	2.6913800000000000
2011-01-01	2.7311300000000000
2012-01-01	4.0885700000000000
2013-01-01	4.3472200000000000
2014-01-01	5.1784600000000000
2015-01-01	4.8731300000000010
2016-01-01	4.9322700000000000