Year	Percent
1969-01-01	0.21087500000000000
1970-01-01	0.28678800000000000
1971-01-01	0.30685800000000000
1972-01-01	0.32078200000000000
1973-01-01	0.30625399999999997
1974-01-01	0.33905500000000000
1975-01-01	0.30592300000000000
1976-01-01	0.49514300000000006
1977-01-01	0.69041400000000010
1978-01-01	0.66510500000000010
1979-01-01	1.89759000000000000
1980-01-01	1.68460000000000000
1981-01-01	2.09230000000000000
1982-01-01	2.41606000000000000
1983-01-01	3.07584000000000040
1984-01-01	4.36777000000000000
1985-01-01	7.26392000000000000
1986-01-01	8.78410000000000000
1987-01-01	9.11820000000000000
1988-01-01	9.99523000000000100
1989-01-01	11.37130000000000000
1990-01-01	12.22440000000000000
1991-01-01	16.56370000000000000
1992-01-01	15.90890000000000000
1993-01-01	21.30750000000000000
1994-01-01	23.79580000000000000
1995-01-01	25.68490000000000000
1996-01-01	27.92100000000000000
1997-01-01	31.78440000000000000
1998-01-01	32.86510000000000000
1999-01-01	32.96630000000000000
2000-01-01	37.41700000000000000
2001-01-01	40.70900000000000000
2002-01-01	47.35560000000000000
2003-01-01	48.78890000000000000
2004-01-01	48.71910000000000000
2005-01-01	44.99490000000000000
2006-01-01	54.24790000000000000
2007-01-01	62.38810000000000000
2008-01-01	61.73560000000000000
2009-01-01	80.14830000000000000
2010-01-01	84.29480000000000000
2011-01-01	68.09590000000000000
2012-01-01	69.59590000000000000
2013-01-01	72.28850000000000000
2014-01-01	57.11090000000000000
2015-01-01	64.53560000000000000
2016-01-01	63.21090000000000000