Year	Percent
1967-01-01	0.030813999999999998
1968-01-01	0.085283000000000000
1969-01-01	0.077252000000000000
1970-01-01	0.066359000000000000
1971-01-01	0.171413000000000000
1972-01-01	0.209972000000000000
1973-01-01	0.190380000000000000
1974-01-01	0.215680000000000000
1975-01-01	0.218115000000000000
1976-01-01	0.325481000000000000
1977-01-01	0.463103000000000000
1978-01-01	0.443922000000000040
1979-01-01	0.521945000000000000
1980-01-01	0.626679000000000000
1981-01-01	0.834882000000000000
1982-01-01	1.277170000000000100
1983-01-01	1.553280000000000000
1984-01-01	2.197770000000000200
1985-01-01	3.341059999999999700
1986-01-01	3.141440000000000200
1987-01-01	3.703600000000000000
1988-01-01	3.763840000000000000
1989-01-01	4.003030000000000000
1990-01-01	4.093000000000000000
1991-01-01	4.893530000000000000
1992-01-01	4.445410000000000000
1993-01-01	6.722339999999999000
1994-01-01	8.327110000000001000
1995-01-01	9.252060000000000000
1996-01-01	8.940740000000000000
1997-01-01	10.259900000000000000
1998-01-01	11.876400000000000000
1999-01-01	15.827800000000000000
2000-01-01	22.008000000000003000
2001-01-01	27.381500000000000000
2002-01-01	31.029400000000000000
2003-01-01	33.506200000000000000
2004-01-01	36.306500000000000000
2005-01-01	34.639400000000000000
2006-01-01	41.811500000000000000
2007-01-01	45.687900000000000000
2008-01-01	45.042700000000000000
2009-01-01	55.773600000000000000
2010-01-01	55.266300000000000000
2011-01-01	51.163700000000000000
2012-01-01	53.807400000000000000
2013-01-01	54.748500000000000000
2014-01-01	46.415300000000000000
2015-01-01	48.341800000000000000
2016-01-01	44.656000000000006000