Year	Percent
1963-01-01	10.22740000000000000
1964-01-01	9.89983000000000000
1965-01-01	10.67910000000000000
1966-01-01	10.00230000000000000
1967-01-01	9.16551000000000100
1968-01-01	9.60397000000000000
1969-01-01	11.09480000000000000
1970-01-01	11.90790000000000000
1971-01-01	13.39010000000000000
1972-01-01	15.16730000000000000
1973-01-01	16.62760000000000000
1974-01-01	14.32500000000000000
1975-01-01	15.50410000000000000
1976-01-01	16.45270000000000000
1977-01-01	19.53599999999999800
1978-01-01	23.61030000000000000
1979-01-01	24.50200000000000000
1980-01-01	25.92310000000000000
1981-01-01	29.29970000000000000
1982-01-01	33.50780000000000000
1983-01-01	36.01690000000000000
1984-01-01	26.89520000000000000
1985-01-01	25.73590000000000000
1986-01-01	25.23390000000000000
1987-01-01	20.27490000000000000
1988-01-01	17.63440000000000000
1989-01-01	11.45990000000000000
1990-01-01	8.64513000000000000
1991-01-01	8.30928000000000100
1992-01-01	8.14218000000000000
1993-01-01	7.13435000000000000
1994-01-01	4.76374000000000000
1995-01-01	3.47371000000000000
1996-01-01	1.65268000000000000
1997-01-01	1.63943000000000000
1998-01-01	1.95419000000000000
1999-01-01	2.15467000000000000
2000-01-01	2.09867000000000030
2001-01-01	1.35509000000000000
2002-01-01	0.48510400000000000
2003-01-01	0.37564899999999996
2004-01-01	0.35333100000000000
2005-01-01	0.39237200000000000
2006-01-01	0.48771700000000000
2007-01-01	0.88446100000000000
2008-01-01	0.70656400000000010
2009-01-01	0.72509000000000000
2010-01-01	0.37416100000000000