Year	Percent
1966-01-01	0.007975000000000000
1967-01-01	0.012417000000000001
1968-01-01	0.099947000000000010
1969-01-01	0.105304000000000000
1970-01-01	0.103078000000000000
1971-01-01	0.155767000000000020
1972-01-01	0.321961999999999970
1973-01-01	0.378355999999999970
1974-01-01	0.377125000000000000
1975-01-01	0.380479000000000000
1976-01-01	0.401366000000000000
1977-01-01	0.434814000000000030
1978-01-01	0.472763000000000000
1979-01-01	0.572081000000000100
1980-01-01	0.678427000000000000
1981-01-01	0.777837000000000000
1982-01-01	1.148129999999999900
1983-01-01	1.224280000000000000
1984-01-01	1.514000000000000000
1985-01-01	2.060490000000000000
1986-01-01	2.706470000000000000
1987-01-01	3.135550000000000000
1988-01-01	3.028830000000000000
1989-01-01	2.766480000000000000
1990-01-01	2.688190000000000000
1991-01-01	2.658309999999999700
1992-01-01	2.461300000000000000
1993-01-01	2.350629999999999800
1994-01-01	2.601370000000000000
1995-01-01	3.265190000000000000
1996-01-01	4.190700000000000000
1997-01-01	4.956140000000000000
1998-01-01	6.490130000000001000
1999-01-01	8.353539999999999000
2000-01-01	10.459400000000000000
2001-01-01	14.642200000000000000
2002-01-01	16.929000000000002000
2003-01-01	18.410700000000000000
2004-01-01	19.071900000000000000
2005-01-01	18.104000000000000000
2006-01-01	20.769800000000000000
2007-01-01	24.274800000000000000
2008-01-01	23.046200000000000000
2009-01-01	23.728600000000000000
2010-01-01	21.706400000000000000
2011-01-01	19.438000000000000000
2012-01-01	18.377600000000000000
2013-01-01	17.871300000000000000
2014-01-01	17.439700000000000000
2015-01-01	17.621000000000000000
2016-01-01	17.872400000000000000