Year	Percent
1960-01-01	9.24949000000000000
1961-01-01	8.95844000000000000
1962-01-01	8.38230000000000000
1963-01-01	8.32545000000000000
1964-01-01	7.61477000000000000
1965-01-01	7.13863000000000000
1966-01-01	7.44493000000000000
1967-01-01	6.87430000000000000
1968-01-01	7.10441000000000100
1969-01-01	9.72663000000000000
1970-01-01	10.40420000000000000
1971-01-01	9.66053000000000000
1972-01-01	9.41151000000000000
1973-01-01	8.04700000000000000
1974-01-01	7.12303000000000000
1975-01-01	7.78557000000000000
1976-01-01	6.09153000000000060
1977-01-01	4.54935000000000000
1978-01-01	4.13922000000000000
1979-01-01	3.96585000000000000
1980-01-01	3.35691000000000000
1981-01-01	4.26802000000000000
1982-01-01	4.26012000000000000
1983-01-01	7.43846000000000100
1984-01-01	10.45820000000000000
1985-01-01	9.24218999999999900
1986-01-01	10.74520000000000000
1987-01-01	8.06185000000000000
1988-01-01	9.84603999999999900
1989-01-01	12.15599999999999900
1990-01-01	8.07001000000000000
1991-01-01	5.86039000000000000
1992-01-01	5.19323000000000100
1993-01-01	12.46000000000000000
1994-01-01	19.48170000000000000
1995-01-01	10.32570000000000000
1996-01-01	0.80710400000000000
1997-01-01	0.61293000000000000
1998-01-01	0.81166100000000000
1999-01-01	4.13800000000000000
2000-01-01	9.75711000000000000
2001-01-01	5.84753000000000000
2002-01-01	4.36008000000000000
2003-01-01	3.79849000000000000
2004-01-01	3.54580000000000000
2005-01-01	3.15983000000000000
2006-01-01	2.66530000000000000
2007-01-01	2.34737000000000000
2008-01-01	1.08722000000000000
2009-01-01	0.19350000000000000
2010-01-01	0.27186900000000000
2011-01-01	0.23813900000000000
2012-01-01	0.21841100000000002
2013-01-01	0.19890000000000000
2014-01-01	0.57918200000000000
2015-01-01	1.22143000000000000
2016-01-01	2.98482000000000000