Year	Percent
1960-01-01	4.0000000000000000
1961-01-01	3.9072800000000000
1962-01-01	4.5409800000000000
1963-01-01	5.2839100000000000
1964-01-01	5.5747100000000000
1965-01-01	5.7859099999999990
1966-01-01	5.7474200000000000
1967-01-01	5.9305200000000000
1968-01-01	6.4349900000000000
1969-01-01	6.6015100000000000
1970-01-01	6.6538900000000000
1971-01-01	6.3436200000000000
1972-01-01	6.2780600000000000
1973-01-01	6.1391300000000010
1974-01-01	6.1263400000000000
1975-01-01	6.1408100000000000
1976-01-01	6.9703600000000000
1977-01-01	7.0339500000000000
1978-01-01	5.8535600000000000
1979-01-01	4.8602900000000000
1980-01-01	7.2743500000000000
1981-01-01	5.9290600000000000
1982-01-01	5.4893900000000000
1983-01-01	5.2582500000000000
1984-01-01	5.0489600000000000
1985-01-01	4.5993900000000005
1986-01-01	4.9671500000000000
1987-01-01	5.0315699999999990
1988-01-01	4.8466600000000000
1989-01-01	5.1001900000000004
1990-01-01	5.3042500000000000
1991-01-01	4.6968100000000000
1992-01-01	4.0831400000000000
1993-01-01	3.5695900000000003
1994-01-01	4.1453800000000000
1995-01-01	4.3888000000000000
1996-01-01	4.2333500000000000
1997-01-01	4.0194900000000000
1998-01-01	3.7487199999999996
1999-01-01	3.9581400000000000
2000-01-01	4.0911300000000010
2001-01-01	3.8247800000000005
2002-01-01	4.0159600000000000
2003-01-01	4.1556000000000000
2004-01-01	4.0883500000000000
2005-01-01	4.7681600000000000
2006-01-01	5.3833100000000000
2007-01-01	6.2218300000000010
2008-01-01	7.0953700000000000
2009-01-01	7.5986500000000000
2010-01-01	8.3326000000000000
2011-01-01	8.7774000000000000
2012-01-01	8.8310900000000000
2013-01-01	12.2255000000000000
2014-01-01	12.1230000000000000
2015-01-01	12.4888000000000000