Year	Percent
1980-01-01	0.30947600000000003
1981-01-01	0.60629100000000000
1982-01-01	0.53694400000000000
1983-01-01	0.48610900000000000
1984-01-01	0.44892100000000000
1985-01-01	0.38210400000000000
1986-01-01	0.14949700000000000
1987-01-01	0.13077800000000000
1988-01-01	1.86027000000000000
1989-01-01	2.53976000000000000
1990-01-01	1.94112000000000020
1991-01-01	3.97034000000000000
1992-01-01	3.89175999999999970
1993-01-01	3.62714000000000030
1994-01-01	4.49852000000000000
1995-01-01	5.20677000000000000
1996-01-01	4.90316999999999900
1997-01-01	5.00740000000000000
1998-01-01	4.83449000000000000
1999-01-01	4.30373000000000100
2000-01-01	4.28400999999999900
2001-01-01	4.40404000000000000
2002-01-01	4.14209000000000050
2003-01-01	5.40666000000000000
2004-01-01	5.51131000000000000
2005-01-01	3.07543000000000000
2006-01-01	1.52483000000000000
2007-01-01	1.41584000000000000
2008-01-01	2.96528000000000000
2009-01-01	3.28388000000000040
2010-01-01	5.39195000000000000
2011-01-01	3.89223000000000000
2012-01-01	4.35926000000000000
2013-01-01	6.71763000000000100
2014-01-01	7.65163000000000000
2015-01-01	7.46312000000000000
2016-01-01	7.56433000000000000