Year	Percent
1974-01-01	0.32864499999999996
1975-01-01	0.31613600000000003
1976-01-01	0.27219800000000000
1977-01-01	0.22451700000000000
1978-01-01	0.23499600000000000
1979-01-01	0.31895900000000000
1980-01-01	0.23317600000000002
1981-01-01	0.20204500000000000
1982-01-01	0.20370700000000000
1983-01-01	0.18161300000000002
1984-01-01	0.16038000000000000
1985-01-01	0.18631000000000000
1986-01-01	0.17326200000000000
1987-01-01	0.12983000000000000
1988-01-01	0.19004900000000000
1989-01-01	0.49021200000000000
1990-01-01	0.49531700000000000
1991-01-01	0.33584000000000000
1992-01-01	0.27889300000000000
1993-01-01	0.28466400000000000
1994-01-01	0.12942700000000000
1995-01-01	0.12075899999999999
1996-01-01	0.11605399999999999
1997-01-01	0.11389600000000000
1998-01-01	0.10786900000000000
1999-01-01	0.10297100000000001
2000-01-01	0.09789900000000000
2001-01-01	0.09392900000000000
2002-01-01	15.04530000000000000
2003-01-01	9.16873000000000000
2004-01-01	7.35043999999999900
2005-01-01	7.30713999999999950
2006-01-01	8.57611000000000000
2007-01-01	7.62928999999999900
2008-01-01	7.56060000000000000
2009-01-01	6.64620000000000000
2010-01-01	5.41495000000000000
2011-01-01	5.16236000000000000
2012-01-01	5.89951000000000000
2013-01-01	5.59721000000000000