Year	Percent
1968-01-01	0.000000000000000220000000000000
1969-01-01	0.000000000000000379999999999999
1970-01-01	0.000000000019000000000000000000
1971-01-01	0.000000000020000000000000002000
1972-01-01	0.000000000001900000000000000000
1973-01-01	0.208736999999999980000000000000
1974-01-01	0.835029999999999900000000000000
1975-01-01	1.743600000000000000000000000000
1976-01-01	2.712730000000000000000000000000
1977-01-01	2.877259999999999700000000000000
1978-01-01	2.825160000000000000000000000000
1979-01-01	2.703190000000000000000000000000
1980-01-01	2.338520000000000000000000000000
1981-01-01	1.977450000000000000000000000000
1982-01-01	1.766409999999999800000000000000
1983-01-01	1.743859999999999700000000000000
1984-01-01	1.830840000000000200000000000000
1985-01-01	1.709790000000000100000000000000
1986-01-01	1.964320000000000000000000000000
1987-01-01	2.417390000000000000000000000000
1988-01-01	2.574620000000000000000000000000
1989-01-01	3.186650000000000000000000000000
1990-01-01	3.574130000000000300000000000000
1991-01-01	5.894030000000000000000000000000
1992-01-01	8.948039999999999000000000000000
1993-01-01	8.881620000000000000000000000000
1994-01-01	9.110160000000000000000000000000
1995-01-01	7.289650000000000000000000000000
1996-01-01	6.926200000000000000000000000000
1997-01-01	6.488270000000000000000000000000
1998-01-01	5.990480000000001000000000000000
1999-01-01	6.104760000000000000000000000000
2000-01-01	6.302969999999999000000000000000
2001-01-01	6.651760000000000000000000000000
2002-01-01	6.707230000000000000000000000000
2003-01-01	6.333190000000000000000000000000
2004-01-01	5.555300000000000000000000000000
2005-01-01	4.400640000000000000000000000000
2006-01-01	2.729320000000000000000000000000
2007-01-01	1.326679999999999900000000000000
2008-01-01	0.501342000000000000000000000000
2009-01-01	0.431610999999999970000000000000
2010-01-01	0.719876000000000100000000000000
2011-01-01	0.712727000000000000000000000000
2012-01-01	1.052840000000000000000000000000
2013-01-01	1.297060000000000000000000000000
2014-01-01	1.191750000000000000000000000000
2015-01-01	1.551580000000000000000000000000
2016-01-01	2.101590000000000300000000000000