Year	Percent
1980-01-01	4.4092000000000000
1981-01-01	5.3754400000000000
1982-01-01	5.9375500000000000
1983-01-01	7.3750800000000005
1984-01-01	11.5975000000000000
1985-01-01	12.4259999999999980
1986-01-01	15.1613000000000000
1987-01-01	16.2684000000000000
1988-01-01	13.7834000000000000
1989-01-01	13.7756000000000000
1990-01-01	13.0447000000000000
1991-01-01	10.3086000000000000
1992-01-01	7.4473000000000000
1993-01-01	14.5019000000000000
1994-01-01	12.3476000000000000
1995-01-01	9.9401200000000000
1996-01-01	9.2322200000000000
1997-01-01	9.2181900000000000
1998-01-01	7.5072000000000000
1999-01-01	6.7543700000000000
2000-01-01	6.5250000000000000
2001-01-01	5.6944099999999995
2002-01-01	4.2992400000000000
2003-01-01	3.7701000000000000
2004-01-01	2.7584299999999997
2005-01-01	2.6553800000000000
2006-01-01	2.3118800000000000
2007-01-01	2.1457000000000000
2008-01-01	3.4235500000000000
2009-01-01	6.8076300000000005
2010-01-01	5.8757300000000000
2011-01-01	6.3562199999999995
2012-01-01	5.3599800000000000
2013-01-01	4.1331300000000000
2014-01-01	3.1535300000000000
2015-01-01	2.3764900000000000
2016-01-01	0.9151520000000001