Year	Percent
1973-01-01	0.67195500000000000
1974-01-01	0.52230700000000000
1975-01-01	0.57163300000000000
1976-01-01	0.47282500000000000
1977-01-01	0.39062500000000000
1978-01-01	0.45629400000000000
1979-01-01	0.38750000000000000
1980-01-01	0.48258500000000004
1981-01-01	0.34942300000000000
1982-01-01	0.36796500000000000
1983-01-01	0.41311499999999995
1984-01-01	0.10307800000000000
1985-01-01	0.10307800000000000
1986-01-01	0.10307800000000000
1987-01-01	0.10307800000000000
1988-01-01	0.10307800000000000
1989-01-01	0.10307800000000000
1990-01-01	0.10307800000000000
1991-01-01	0.10307800000000000
1992-01-01	0.10307800000000000
1993-01-01	0.10307800000000000
1994-01-01	0.10307800000000000
1995-01-01	5.19870000000000000
1996-01-01	7.45151000000000100
1997-01-01	4.69131000000000000
1998-01-01	5.43989000000000000
1999-01-01	3.77269000000000030
2000-01-01	3.86708000000000000
2001-01-01	3.18595000000000000
2002-01-01	2.93851000000000000
2003-01-01	2.39144000000000020
2004-01-01	2.37209000000000000
2005-01-01	2.65410000000000000
2006-01-01	2.88092000000000000
2007-01-01	2.74734000000000030
2008-01-01	1.76607999999999990
2009-01-01	2.33869000000000000
2010-01-01	2.09958000000000000
2011-01-01	1.84340999999999980
2012-01-01	1.91126000000000000
2013-01-01	1.58189000000000000