Year	Percent
1960-01-01	5.6806300000000010
1961-01-01	5.8107000000000000
1962-01-01	6.4309199999999995
1963-01-01	7.2603500000000000
1964-01-01	8.4735600000000000
1965-01-01	9.7923500000000000
1966-01-01	10.2737000000000000
1967-01-01	9.9688800000000000
1968-01-01	10.4299000000000000
1969-01-01	11.8110000000000000
1970-01-01	12.7592000000000000
1971-01-01	13.3234000000000000
1972-01-01	17.2312000000000000
1973-01-01	17.5394000000000000
1974-01-01	15.6072000000000000
1975-01-01	16.0534000000000000
1976-01-01	17.6425000000000000
1977-01-01	19.2815000000000000
1978-01-01	20.9503000000000000
1979-01-01	22.6210000000000000
1980-01-01	26.7762000000000000
1981-01-01	29.2614000000000000
1982-01-01	29.2614000000000000
1983-01-01	29.2614000000000000
1984-01-01	29.2614000000000000
1985-01-01	29.2614000000000000
1986-01-01	29.2614000000000000
1987-01-01	29.2614000000000000
1988-01-01	29.2614000000000000
1989-01-01	29.2614000000000000
1990-01-01	29.2614000000000000
1991-01-01	29.2614000000000000
1992-01-01	29.2614000000000000
1993-01-01	29.2614000000000000
1994-01-01	29.2614000000000000
1995-01-01	29.2614000000000000
1996-01-01	29.2614000000000000
1997-01-01	29.2614000000000000
1998-01-01	29.2614000000000000
1999-01-01	29.2614000000000000
2000-01-01	29.2614000000000000
2001-01-01	29.2614000000000000
2002-01-01	29.2614000000000000
2003-01-01	29.2614000000000000
2004-01-01	29.2614000000000000
2005-01-01	29.2614000000000000
2006-01-01	23.0226000000000000
2007-01-01	22.7090000000000000
2008-01-01	27.7575000000000000
2009-01-01	28.0904000000000000
2010-01-01	31.1278000000000000
2011-01-01	33.1948000000000000
2012-01-01	31.0544000000000000
2013-01-01	31.5832000000000000
2014-01-01	32.6134000000000000
2015-01-01	32.5265000000000000
2016-01-01	32.6689000000000000