Year	Percent
1973-01-01	0.35879099999999997
1974-01-01	0.29314500000000000
1975-01-01	0.23113400000000000
1976-01-01	0.40754600000000000
1977-01-01	0.30326900000000000
1978-01-01	0.26580500000000000
1979-01-01	0.22968600000000000
1980-01-01	0.21620300000000000
1981-01-01	0.23717500000000000
1982-01-01	0.22465600000000000
1983-01-01	0.21935600000000000
1984-01-01	0.19001300000000002
1985-01-01	0.21497199999999997
1986-01-01	0.20746199999999998
1987-01-01	0.17843599999999998
1988-01-01	0.15601900000000002
1989-01-01	0.07174000000000000
1990-01-01	0.07174000000000000
1991-01-01	0.07174000000000000
1992-01-01	0.07174000000000000
1993-01-01	0.07174000000000000
1994-01-01	0.07174000000000000
1995-01-01	17.21800000000000000
1996-01-01	12.35660000000000000
1997-01-01	23.49390000000000000
1998-01-01	10.08560000000000000
1999-01-01	10.18850000000000000
2000-01-01	11.67300000000000000
2001-01-01	11.07880000000000000
2002-01-01	9.95390000000000000
2003-01-01	7.95735000000000000
2004-01-01	7.27901000000000000
2005-01-01	6.97691000000000000
2006-01-01	6.62327000000000000
2007-01-01	5.73644000000000000
2008-01-01	4.74718000000000000
2009-01-01	4.66686999999999900
2010-01-01	10.41610000000000000
2011-01-01	10.11360000000000000
2012-01-01	9.38220000000000000
2013-01-01	8.00370000000000000
2014-01-01	9.10026000000000000
2015-01-01	13.37750000000000000
2016-01-01	12.06400000000000000