Year	Percent
1977-01-01	0.4652220000000000
1978-01-01	0.8992690000000001
1979-01-01	1.4159300000000000
1980-01-01	3.5148200000000000
1981-01-01	3.8335900000000000
1982-01-01	1.4406000000000000
1983-01-01	3.3348300000000000
1984-01-01	2.9353500000000000
1985-01-01	2.1026599999999998
1986-01-01	0.7186220000000000
1987-01-01	0.6837710000000000
1988-01-01	1.4114799999999998
1989-01-01	2.7252600000000000
1990-01-01	0.4988460000000000
1991-01-01	0.3989730000000000
1992-01-01	1.7585500000000000
1993-01-01	0.8466770000000000
1994-01-01	0.8378800000000000
1995-01-01	2.5033000000000000
1996-01-01	2.4563500000000000
1997-01-01	3.5920099999999997
1998-01-01	6.1029300000000010
1999-01-01	6.2263400000000000
2000-01-01	5.2278500000000000
2001-01-01	5.6102600000000000
2002-01-01	6.6045899999999990
2003-01-01	6.9339500000000000
2004-01-01	6.5382800000000000
2005-01-01	2.6533500000000000
2006-01-01	2.2355500000000000
2007-01-01	2.1780700000000000
2008-01-01	2.9171600000000000
2009-01-01	2.6235000000000000
2010-01-01	2.2176500000000000
2011-01-01	1.2242000000000000
2012-01-01	0.8746240000000000
2013-01-01	0.8596420000000000
2014-01-01	0.6166119999999999
2015-01-01	0.1558230000000000
2016-01-01	0.1604980000000000
2017-01-01	0.1812410000000000