Year	Percent
1980-01-01	0.0020780000000000000
1981-01-01	0.0022960000000000003
1982-01-01	0.2713530000000000000
1983-01-01	0.3419120000000000000
1984-01-01	0.6499790000000000000
1985-01-01	1.1098800000000000000
1986-01-01	0.9432320000000000000
1987-01-01	1.3069000000000000000
1988-01-01	1.2513100000000001000
1989-01-01	1.1142200000000000000
1990-01-01	1.2499600000000000000
1991-01-01	1.5992600000000001000
1992-01-01	1.3389600000000000000
1993-01-01	2.7252600000000000000
1994-01-01	3.6934400000000003000
1995-01-01	4.1243700000000000000
1996-01-01	3.9335100000000000000
1997-01-01	4.2115700000000000000
1998-01-01	4.6847699999999990000
1999-01-01	4.4389100000000000000
2000-01-01	5.7907100000000000000
2001-01-01	6.2143900000000000000
2002-01-01	6.9755600000000010000
2003-01-01	7.6366200000000000000
2004-01-01	8.0707300000000010000
2005-01-01	7.4299000000000000000
2006-01-01	7.3405200000000000000
2007-01-01	6.8865300000000005000
2008-01-01	5.2115000000000000000
2009-01-01	5.9754100000000000000
2010-01-01	6.8353100000000010000
2011-01-01	6.1903100000000000000
2012-01-01	6.6579399999999990000
2013-01-01	6.4733500000000000000
2014-01-01	5.4623500000000000000
2015-01-01	5.2558400000000000000
2016-01-01	4.9295500000000000000