Year	Percent
1960-01-01	7.7305899999999990
1961-01-01	7.5461300000000010
1962-01-01	8.3130100000000000
1963-01-01	8.4077000000000000
1964-01-01	7.1829100000000010
1965-01-01	6.6049100000000000
1966-01-01	6.5971899999999990
1967-01-01	6.8668300000000000
1968-01-01	7.0147500000000000
1969-01-01	7.6612800000000005
1970-01-01	9.5121200000000000
1971-01-01	10.1630000000000000
1972-01-01	10.0181000000000000
1973-01-01	11.9889000000000000
1974-01-01	13.0013000000000000
1975-01-01	12.4758000000000000
1976-01-01	13.7718000000000000
1977-01-01	16.5597000000000000
1978-01-01	18.7404000000000000
1979-01-01	18.6712000000000000
1980-01-01	16.4583000000000000
1981-01-01	15.0625000000000000
1982-01-01	15.6276000000000000
1983-01-01	17.2487000000000000
1984-01-01	16.9357000000000000
1985-01-01	16.1587000000000000
1986-01-01	15.2418000000000000
1987-01-01	14.6937000000000000
1988-01-01	15.7353000000000000
1989-01-01	16.2188000000000000
1990-01-01	16.9052000000000000
1991-01-01	16.5818000000000000
1992-01-01	17.1925000000000000
1993-01-01	15.9518000000000000
1994-01-01	14.3803000000000000
1995-01-01	13.6348000000000000
1996-01-01	14.5402000000000000
1997-01-01	15.4873000000000000
1998-01-01	15.1591000000000000
1999-01-01	15.7189000000000000
2000-01-01	17.0883000000000000
2001-01-01	18.0765000000000000
2002-01-01	19.4709000000000000
2003-01-01	21.2963000000000000
2004-01-01	23.7602000000000000
2005-01-01	24.5819000000000000
2006-01-01	24.8907000000000000
2007-01-01	25.4325000000000000
2008-01-01	25.2392000000000000
2009-01-01	26.4725000000000000
2010-01-01	28.7688000000000000
2011-01-01	30.0031000000000000
2012-01-01	30.1296000000000000
2013-01-01	32.4443000000000000
2014-01-01	34.4737000000000000
2015-01-01	36.1639000000000000
2016-01-01	36.1777000000000000