Year	Percent
1960-01-01	6.4676000000000000
1961-01-01	6.3032100000000000
1962-01-01	6.8634200000000000
1963-01-01	6.7728800000000010
1964-01-01	6.9311000000000000
1965-01-01	7.3994899999999990
1966-01-01	8.2299500000000000
1967-01-01	8.5641900000000000
1968-01-01	8.5660899999999990
1969-01-01	8.9616600000000000
1970-01-01	6.6466600000000010
1971-01-01	6.2269300000000000
1972-01-01	5.9642400000000000
1973-01-01	6.0356700000000000
1974-01-01	6.1499100000000000
1975-01-01	5.1841500000000000
1976-01-01	4.7601500000000000
1977-01-01	3.1218600000000000
1978-01-01	2.8048700000000000
1979-01-01	1.9352400000000000
1980-01-01	2.1791300000000000
1981-01-01	2.7867900000000003
1982-01-01	2.6032800000000000
1983-01-01	2.5713700000000000
1984-01-01	1.6624900000000002
1985-01-01	1.5600100000000001
1986-01-01	1.6270300000000000
1987-01-01	1.4251000000000000
1988-01-01	1.3780900000000000
1989-01-01	1.7090500000000000
1990-01-01	2.6892300000000000
1991-01-01	2.5837900000000000
1992-01-01	3.2230400000000000
1993-01-01	3.3018000000000000
1994-01-01	3.8274900000000000
1995-01-01	3.8876699999999995
1996-01-01	4.5482200000000000
1997-01-01	4.5882400000000000
1998-01-01	4.6121600000000000
1999-01-01	5.2140600000000000
2000-01-01	5.0587500000000000
2001-01-01	5.6963400000000000
2002-01-01	6.3812000000000000
2003-01-01	7.1215500000000000
2004-01-01	7.1775400000000000
2005-01-01	7.4307700000000000
2006-01-01	7.9900000000000000
2007-01-01	8.3868900000000000
2008-01-01	9.2576600000000010
2009-01-01	9.8614699999999990
2010-01-01	10.5279999999999990
2011-01-01	11.9698000000000000
2012-01-01	12.5703000000000000
2013-01-01	12.5990000000000000
2014-01-01	12.6883000000000000
2015-01-01	12.9448000000000000
2016-01-01	13.3613000000000000