Year	Percent
1968-01-01	0.028652999999999998
1969-01-01	0.079874000000000000
1970-01-01	0.080354000000000000
1971-01-01	0.251158000000000000
1972-01-01	0.707203999999999900
1973-01-01	1.378429999999999800
1974-01-01	1.544160000000000000
1975-01-01	1.438640000000000000
1976-01-01	2.017070000000000000
1977-01-01	2.351500000000000000
1978-01-01	2.242450000000000000
1979-01-01	1.913470000000000000
1980-01-01	1.656970000000000000
1981-01-01	1.858290000000000200
1982-01-01	2.220180000000000000
1983-01-01	2.637770000000000000
1984-01-01	3.485900000000000000
1985-01-01	4.583010000000000000
1986-01-01	4.509080000000000000
1987-01-01	4.844980000000000500
1988-01-01	5.263030000000000500
1989-01-01	6.275320000000000000
1990-01-01	7.879750000000000000
1991-01-01	10.273500000000000000
1992-01-01	10.821500000000000000
1993-01-01	11.917300000000000000
1994-01-01	13.247400000000000000
1995-01-01	12.359700000000000000
1996-01-01	14.585000000000000000
1997-01-01	15.594200000000000000
1998-01-01	18.058200000000000000
1999-01-01	24.793000000000003000
2000-01-01	30.597800000000000000
2001-01-01	34.661000000000000000
2002-01-01	40.727300000000000000
2003-01-01	49.684000000000000000
2004-01-01	53.707600000000000000
2005-01-01	56.647900000000000000
2006-01-01	71.675800000000000000
2007-01-01	76.643999999999990000
2008-01-01	90.471800000000000000
2009-01-01	125.375000000000000000
2010-01-01	118.775000000000000000
2011-01-01	108.547000000000010000
2012-01-01	106.589000000000000000
2013-01-01	103.356000000000010000
2014-01-01	86.858500000000000000
2015-01-01	86.514900000000000000
2016-01-01	88.292000000000000000