Year	Percent
1960-01-01	10.9405000000000000
1961-01-01	11.2020000000000000
1962-01-01	11.6757000000000000
1963-01-01	12.0100000000000000
1964-01-01	12.5197000000000000
1965-01-01	11.6633000000000000
1966-01-01	11.5273000000000000
1967-01-01	11.9065000000000000
1968-01-01	12.8216000000000000
1969-01-01	13.4709000000000000
1970-01-01	10.2344000000000000
1971-01-01	9.3401600000000010
1972-01-01	10.2479000000000000
1973-01-01	11.5008000000000000
1974-01-01	11.7842000000000000
1975-01-01	10.7858000000000000
1976-01-01	10.9679000000000000
1977-01-01	12.1676000000000000
1978-01-01	13.4885000000000000
1979-01-01	12.1917000000000000
1980-01-01	13.3072000000000000
1981-01-01	12.5007000000000000
1982-01-01	13.5311000000000000
1983-01-01	14.4625000000000000
1984-01-01	12.1818000000000000
1985-01-01	10.7458000000000000
1986-01-01	8.2674300000000010
1987-01-01	7.7374399999999990
1988-01-01	7.8864800000000010
1989-01-01	7.8153000000000000
1990-01-01	9.7713100000000000
1991-01-01	7.3199700000000000
1992-01-01	7.3882900000000000
1993-01-01	7.2906300000000000
1994-01-01	6.8204899999999995
1995-01-01	6.3503300000000005
1996-01-01	6.0240800000000005
1997-01-01	8.7329700000000000
1998-01-01	8.7189400000000000
1999-01-01	9.5056800000000000
2000-01-01	10.6053000000000000
2001-01-01	11.7365000000000000
2002-01-01	12.6881000000000000
2003-01-01	12.8446000000000000
2004-01-01	12.9131000000000000
2005-01-01	15.1826000000000000
2006-01-01	14.2977000000000000
2007-01-01	15.2534000000000000
2008-01-01	16.3851000000000000
2009-01-01	18.2911000000000000
2010-01-01	19.2671000000000000
2011-01-01	19.5079000000000000
2012-01-01	18.5376000000000000
2013-01-01	16.7467000000000000
2014-01-01	18.4939000000000000
2015-01-01	22.8463000000000000
2016-01-01	23.3222000000000000