Year	Percent
1960-01-01	8.3551800000000000
1961-01-01	9.3194200000000000
1962-01-01	8.6409000000000000
1963-01-01	8.9878400000000000
1964-01-01	8.9878400000000000
1965-01-01	8.9878400000000000
1966-01-01	8.9878400000000000
1967-01-01	8.9878400000000000
1968-01-01	8.9878400000000000
1969-01-01	5.3898600000000000
1970-01-01	6.3674000000000000
1971-01-01	7.2069800000000010
1972-01-01	6.8985899999999996
1973-01-01	5.0374099999999995
1974-01-01	4.5482900000000000
1975-01-01	4.1533500000000000
1976-01-01	3.8204700000000000
1977-01-01	3.6599199999999996
1978-01-01	4.0886700000000000
1979-01-01	5.1087500000000000
1980-01-01	6.1428199999999995
1981-01-01	7.2187399999999995
1982-01-01	8.6012200000000000
1983-01-01	10.1618000000000000
1984-01-01	11.3105000000000000
1985-01-01	12.7815000000000000
1986-01-01	13.3276000000000000
1987-01-01	13.7776000000000000
1988-01-01	12.4154000000000000
1989-01-01	8.1907300000000000
1990-01-01	7.8480600000000000
1991-01-01	8.6497600000000000
1992-01-01	8.7217100000000000
1993-01-01	7.9563200000000000
1994-01-01	7.6947800000000010
1995-01-01	9.4905400000000000
1996-01-01	10.4587000000000000
1997-01-01	8.7601800000000000
1998-01-01	9.2792000000000000
1999-01-01	9.6340200000000000
2000-01-01	12.7351000000000000
2001-01-01	13.5759999999999990
2002-01-01	11.9191000000000000
2003-01-01	7.8777000000000000
2004-01-01	5.6343600000000000
2005-01-01	5.6759300000000000
2006-01-01	5.2834800000000000
2007-01-01	5.4702300000000000
2008-01-01	6.3473800000000000
2009-01-01	7.2609300000000000
2010-01-01	10.1791000000000000
2011-01-01	13.3071000000000000
2012-01-01	16.8354000000000000
2013-01-01	21.1477000000000000
2014-01-01	24.8202000000000000
2015-01-01	29.4346000000000000
2016-01-01	33.3219999999999960