Year	Percent
1973-01-01	16.557000000000002
1974-01-01	14.456900000000000
1975-01-01	13.701900000000000
1976-01-01	13.881700000000000
1977-01-01	14.860400000000000
1978-01-01	18.689100000000000
1979-01-01	20.885500000000000
1980-01-01	18.696300000000000
1981-01-01	15.413500000000000
1982-01-01	14.461400000000000
1983-01-01	14.569500000000000
1984-01-01	14.423300000000000
1985-01-01	14.912400000000000
1986-01-01	15.749900000000000
1987-01-01	14.219700000000000
1988-01-01	13.535500000000000
1989-01-01	20.148700000000000
1990-01-01	20.148700000000000
1991-01-01	43.589900000000000
1992-01-01	81.258200000000000
1993-01-01	134.124000000000000
1994-01-01	192.872000000000000
1995-01-01	182.986000000000000
1996-01-01	83.672200000000000
1997-01-01	26.230300000000000
1998-01-01	216.500000000000000
1999-01-01	313.490000000000000
2000-01-01	191.782000000000000
2001-01-01	217.904000000000020
2002-01-01	286.147999999999970
2003-01-01	396.070999999999970
2004-01-01	356.363000000000060
2005-01-01	388.147000000000000
2006-01-01	435.850000000000000
2007-01-01	476.418000000000000
2008-01-01	603.959000000000100
2009-01-01	840.088000000000100
2010-01-01	14.325500000000000
2011-01-01	15.312999999999999
2012-01-01	16.212100000000000
2013-01-01	18.574300000000000