Year	Percent
1980-01-01	0.30432800000000004
1981-01-01	0.41568000000000000
1982-01-01	0.55760500000000000
1983-01-01	1.37431000000000010
1984-01-01	2.93055000000000000
1985-01-01	4.93959000000000000
1986-01-01	6.18511000000000000
1987-01-01	5.54068000000000000
1988-01-01	5.29075000000000000
1989-01-01	5.47291000000000000
1990-01-01	5.45602000000000000
1991-01-01	6.13753000000000000
1992-01-01	5.24919000000000050
1993-01-01	7.13104000000000000
1994-01-01	7.92043999999999900
1995-01-01	7.17791000000000100
1996-01-01	5.55540000000000000
1997-01-01	5.76234000000000000
1998-01-01	4.79159000000000000
1999-01-01	3.36821000000000000
2000-01-01	3.12395000000000000
2001-01-01	6.02350000000000000
2002-01-01	7.52807000000000000
2003-01-01	6.68863999999999950
2004-01-01	6.13837000000000000
2005-01-01	5.01423000000000000
2006-01-01	3.68598000000000030
2007-01-01	5.07322000000000000
2008-01-01	6.01198000000000000
2009-01-01	8.87193999999999900
2010-01-01	10.01600000000000000
2011-01-01	8.06447000000000000
2012-01-01	6.22989000000000000
2013-01-01	6.04260000000000000
2014-01-01	4.18066000000000000
2015-01-01	4.51436000000000000
2016-01-01	4.27931999999999900