Year	Percent
1960-01-01	9.290880000000000
1961-01-01	9.262139999999999
1962-01-01	9.400130000000000
1963-01-01	9.932480000000000
1964-01-01	10.107200000000000
1965-01-01	10.543700000000000
1966-01-01	11.173800000000000
1967-01-01	11.284200000000000
1968-01-01	11.581200000000000
1969-01-01	12.893100000000000
1970-01-01	9.149380000000000
1971-01-01	10.131000000000000
1972-01-01	10.489800000000000
1973-01-01	11.124400000000000
1974-01-01	11.471800000000000
1975-01-01	11.781700000000000
1976-01-01	11.921000000000000
1977-01-01	12.665999999999999
1978-01-01	13.566600000000000
1979-01-01	13.381900000000000
1980-01-01	12.980100000000000
1981-01-01	12.942000000000000
1982-01-01	14.545200000000000
1983-01-01	16.456000000000000
1984-01-01	17.422600000000000
1985-01-01	16.609400000000000
1986-01-01	16.686600000000000
1987-01-01	17.587700000000000
1988-01-01	18.270200000000000
1989-01-01	18.557000000000002
1990-01-01	17.423300000000000
1991-01-01	16.699800000000000
1992-01-01	17.457500000000000
1993-01-01	16.980900000000000
1994-01-01	15.711200000000000
1995-01-01	15.705700000000000
1996-01-01	17.658900000000000
1997-01-01	22.944200000000000
1998-01-01	27.949500000000000
1999-01-01	31.308700000000000
2000-01-01	32.563000000000000
2001-01-01	35.029700000000000
2002-01-01	37.040100000000000
2003-01-01	37.830000000000000
2004-01-01	38.431200000000000
2005-01-01	39.847700000000000
2006-01-01	42.478300000000000
2007-01-01	45.609100000000000
2008-01-01	46.453800000000000
2009-01-01	45.161800000000000
2010-01-01	43.541400000000000
2011-01-01	43.450800000000000
2012-01-01	44.305000000000000
2013-01-01	46.008800000000000
2014-01-01	46.711300000000000
2015-01-01	46.351600000000000
2016-01-01	47.720000000000000