Year	Percent
1970-01-01	0.055808000000000000
1971-01-01	0.048185000000000006
1972-01-01	0.100446000000000010
1973-01-01	0.114396000000000000
1974-01-01	0.141112000000000000
1975-01-01	0.178608000000000000
1976-01-01	0.235425000000000000
1977-01-01	0.305904000000000000
1978-01-01	0.364255999999999970
1979-01-01	0.328698000000000000
1980-01-01	0.296505000000000000
1981-01-01	0.362910000000000000
1982-01-01	0.484464000000000000
1983-01-01	0.791123999999999900
1984-01-01	1.086570000000000000
1985-01-01	1.588050000000000000
1986-01-01	2.230070000000000000
1987-01-01	2.753650000000000000
1988-01-01	3.081020000000000000
1989-01-01	3.659459999999999700
1990-01-01	3.466469999999999700
1991-01-01	3.840490000000000000
1992-01-01	3.897830000000000400
1993-01-01	5.081570000000000000
1994-01-01	6.853730000000000500
1995-01-01	8.182410000000000000
1996-01-01	11.066400000000000000
1997-01-01	14.625200000000000000
1998-01-01	18.219600000000000000
1999-01-01	23.827700000000000000
2000-01-01	34.959000000000000000
2001-01-01	39.222200000000000000
2002-01-01	48.113000000000000000
2003-01-01	52.025000000000000000
2004-01-01	56.347000000000000000
2005-01-01	54.626500000000000000
2006-01-01	64.630900000000000000
2007-01-01	65.876500000000000000
2008-01-01	57.542100000000000000
2009-01-01	63.481100000000000000
2010-01-01	59.167700000000000000
2011-01-01	54.121900000000000000
2012-01-01	58.407500000000000000
2013-01-01	54.496800000000000000
2014-01-01	48.772400000000000000
2015-01-01	50.769400000000000000
2016-01-01	49.107600000000000000