Year	Percent
1966-01-01	12.149800000000000
1967-01-01	11.093400000000000
1968-01-01	12.346100000000000
1969-01-01	13.810700000000000
1970-01-01	15.140100000000000
1971-01-01	12.894600000000000
1972-01-01	13.699800000000000
1973-01-01	15.987400000000000
1974-01-01	7.953770000000000
1975-01-01	9.507090000000000
1976-01-01	10.312200000000000
1977-01-01	14.044200000000000
1978-01-01	17.037800000000000
1979-01-01	17.037800000000000
1980-01-01	17.037800000000000
1981-01-01	17.037800000000000
1982-01-01	17.037800000000000
1983-01-01	17.037800000000000
1984-01-01	17.037800000000000
1985-01-01	17.037800000000000
1986-01-01	17.037800000000000
1987-01-01	17.037800000000000
1988-01-01	17.037800000000000
1989-01-01	17.037800000000000
1990-01-01	17.037800000000000
1991-01-01	17.037800000000000
1992-01-01	17.037800000000000
1993-01-01	17.037800000000000
1994-01-01	17.037800000000000
1995-01-01	17.037800000000000
1996-01-01	17.037800000000000
1997-01-01	17.037800000000000
1998-01-01	17.037800000000000
1999-01-01	17.037800000000000
2000-01-01	17.037800000000000
2001-01-01	17.037800000000000
2002-01-01	28.648900000000000
2003-01-01	27.019000000000002
2004-01-01	25.700200000000000
2005-01-01	27.744300000000000
2006-01-01	30.488200000000000
2007-01-01	34.380300000000000
2008-01-01	36.174200000000000
2009-01-01	50.027500000000000
2010-01-01	42.687900000000000
2011-01-01	36.064400000000000
2012-01-01	35.802300000000000
2013-01-01	36.966000000000000
2014-01-01	41.838700000000000
2015-01-01	62.718400000000000
2016-01-01	77.692900000000000