Year	Percent
1973-01-01	26.306200000000000
1974-01-01	29.591700000000000
1975-01-01	25.085100000000000
1976-01-01	21.113700000000000
1977-01-01	22.956999999999997
1978-01-01	23.892800000000000
1979-01-01	20.538400000000000
1980-01-01	20.286300000000000
1981-01-01	22.846400000000000
1982-01-01	24.818900000000000
1983-01-01	26.522800000000000
1984-01-01	26.963500000000000
1985-01-01	26.382500000000000
1986-01-01	29.616900000000000
1987-01-01	32.565300000000000
1988-01-01	35.894100000000000
1989-01-01	39.326600000000000
1990-01-01	39.441900000000000
1991-01-01	41.748500000000000
1992-01-01	42.561700000000000
1993-01-01	43.481300000000000
1994-01-01	48.334800000000000
1995-01-01	49.687500000000000
1996-01-01	51.126500000000000
1997-01-01	51.020100000000000
1998-01-01	64.875100000000000
1999-01-01	84.869500000000000
2000-01-01	90.689900000000000
2001-01-01	100.437000000000010
2002-01-01	102.243000000000000
2003-01-01	109.180000000000000
2004-01-01	90.384800000000000
2005-01-01	79.394300000000000
2006-01-01	72.304500000000000
2007-01-01	58.849700000000000
2008-01-01	51.001000000000005
2009-01-01	42.492000000000000
2010-01-01	40.552600000000000
2011-01-01	40.357700000000000
2012-01-01	37.431900000000000
2013-01-01	38.500100000000000
2014-01-01	41.265500000000000
2015-01-01	44.474400000000000
2016-01-01	46.472500000000000