Year	Percent
1961-01-01	12.875100000000000
1962-01-01	12.213500000000000
1963-01-01	12.260700000000000
1964-01-01	11.388600000000000
1965-01-01	10.551100000000000
1966-01-01	10.444700000000000
1967-01-01	10.109600000000000
1968-01-01	9.696710000000001
1969-01-01	9.015780000000000
1970-01-01	9.527239999999999
1971-01-01	10.405999999999999
1972-01-01	11.846700000000000
1973-01-01	14.057500000000000
1974-01-01	13.123700000000000
1975-01-01	11.920500000000000
1976-01-01	14.409500000000000
1977-01-01	16.292400000000000
1978-01-01	17.950900000000000
1979-01-01	17.797500000000000
1980-01-01	14.934600000000000
1981-01-01	11.768100000000000
1982-01-01	11.887900000000000
1983-01-01	14.413400000000000
1984-01-01	14.218300000000000
1985-01-01	14.194200000000000
1986-01-01	15.563800000000000
1987-01-01	14.827800000000000
1988-01-01	15.005999999999998
1989-01-01	23.473700000000000
1990-01-01	23.473700000000000
1991-01-01	47.348900000000000
1992-01-01	96.753200000000000
1993-01-01	216.280000000000000
1994-01-01	342.589000000000000
1995-01-01	373.721000000000000
1996-01-01	266.854000000000040
1997-01-01	112.943000000000000
1998-01-01	234.537999999999980
1999-01-01	329.772000000000000
2000-01-01	219.382000000000000
2001-01-01	213.845000000000000
2002-01-01	244.619000000000030
2003-01-01	371.573000000000040
2004-01-01	403.135000000000000
2005-01-01	529.604000000000000
2006-01-01	661.663000000000000
2007-01-01	763.781000000000100
2008-01-01	21.466100000000000
2009-01-01	21.795200000000000
2010-01-01	25.727200000000000
2011-01-01	28.786300000000000
2012-01-01	28.874900000000000
2013-01-01	28.491000000000000