Year	Percent
1960-01-01	10.9600000000000000
1961-01-01	10.1087000000000000
1962-01-01	7.9166700000000000
1963-01-01	5.2924200000000000
1964-01-01	3.8192000000000000
1965-01-01	3.2381000000000000
1966-01-01	3.2436500000000000
1967-01-01	3.5025100000000000
1968-01-01	3.0104300000000000
1969-01-01	3.4855000000000000
1970-01-01	4.7608900000000000
1971-01-01	5.6200800000000010
1972-01-01	6.4108900000000000
1973-01-01	7.8661000000000000
1974-01-01	8.1549199999999990
1975-01-01	13.6454000000000000
1976-01-01	13.1807000000000000
1977-01-01	13.0685000000000000
1978-01-01	16.2561000000000000
1979-01-01	11.9512000000000000
1980-01-01	11.9512000000000000
1981-01-01	11.9512000000000000
1982-01-01	11.9512000000000000
1983-01-01	11.9512000000000000
1984-01-01	11.9512000000000000
1985-01-01	11.9512000000000000
1986-01-01	11.9512000000000000
1987-01-01	11.9512000000000000
1988-01-01	11.9512000000000000
1989-01-01	11.9512000000000000
1990-01-01	11.9512000000000000
1991-01-01	11.9512000000000000
1992-01-01	11.9512000000000000
1993-01-01	11.9512000000000000
1994-01-01	11.9512000000000000
1995-01-01	11.9512000000000000
1996-01-01	11.9512000000000000
1997-01-01	11.9512000000000000
1998-01-01	11.9512000000000000
1999-01-01	11.9512000000000000
2000-01-01	22.6619000000000000
2001-01-01	19.5999000000000000
2002-01-01	14.8638000000000000
2003-01-01	12.8367000000000000
2004-01-01	10.2758000000000000
2005-01-01	7.8741500000000000
2006-01-01	6.3695400000000000
2007-01-01	5.8529800000000005
2008-01-01	7.2478800000000000
2009-01-01	12.6250000000000000
2010-01-01	9.8999000000000000
2011-01-01	22.3241000000000000
2012-01-01	9.2954400000000000
2013-01-01	18.3059999999999970
2014-01-01	18.3059999999999970
2015-01-01	58.8318000000000000
2016-01-01	48.4030000000000000