Year	Percent
1963-01-01	32.4022400000000000
1964-01-01	33.1690700000000000
1965-01-01	30.6894500000000000
1966-01-01	27.6569900000000040
1967-01-01	27.3180800000000000
1968-01-01	28.4424900000000030
1969-01-01	28.8222200000000000
1970-01-01	27.1152099999999980
1971-01-01	32.5072400000000000
1972-01-01	42.1408599999999960
1973-01-01	45.8727800000000000
1974-01-01	47.6916100000000000
1975-01-01	46.9655500000000000
1976-01-01	41.7802400000000000
1977-01-01	35.3371900000000000
1978-01-01	31.4776800000000000
1979-01-01	27.9405200000000030
1980-01-01	29.4317500000000000
1981-01-01	27.4696700000000000
1982-01-01	27.4696700000000000
1983-01-01	27.4696700000000000
1984-01-01	25.3887900000000000
1985-01-01	28.3043800000000000
1986-01-01	28.1975600000000000
1987-01-01	42.6689900000000000
1988-01-01	30.8592200000000000
1989-01-01	19.2000700000000000
1990-01-01	11.5051100000000000
1991-01-01	6.4230599999999995
1992-01-01	4.7203029999999995
1993-01-01	5.5359169999999995
1994-01-01	17.1702000000000000
1995-01-01	43.4014600000000000
1996-01-01	43.4014600000000000
1997-01-01	43.4014600000000000
1998-01-01	43.4014600000000000
1999-01-01	43.4014600000000000
2000-01-01	8.8767910000000000
2001-01-01	37.2336800000000000
2002-01-01	38.7610700000000040
2003-01-01	49.5526800000000000
2004-01-01	39.8844900000000000
2005-01-01	40.1899600000000000
2006-01-01	53.0541699999999900
2007-01-01	64.9973000000000000
2008-01-01	75.2612300000000000
2009-01-01	83.1853100000000000
2010-01-01	94.0363100000000000
2011-01-01	61.0634800000000060
2012-01-01	47.7374900000000000
2013-01-01	55.4423199999999950
2014-01-01	63.3331300000000040