Year	Percent
1974-01-01	0.09752600000000000
1975-01-01	0.08753800000000000
1976-01-01	0.31229700000000000
1977-01-01	0.43642900000000000
1978-01-01	0.47001400000000004
1979-01-01	0.38156500000000000
1980-01-01	0.47090800000000000
1981-01-01	0.44735600000000003
1982-01-01	0.42302399999999996
1983-01-01	0.54582400000000000
1984-01-01	1.18016000000000000
1985-01-01	2.71658000000000000
1986-01-01	3.32188000000000000
1987-01-01	3.52555000000000000
1988-01-01	2.42938000000000000
1989-01-01	1.77188000000000000
1990-01-01	1.60158000000000000
1991-01-01	2.20364000000000000
1992-01-01	2.86530000000000000
1993-01-01	3.87132000000000000
1994-01-01	4.27741000000000000
1995-01-01	4.83303000000000000
1996-01-01	7.09431000000000100
1997-01-01	9.07026000000000100
1998-01-01	14.12220000000000000
1999-01-01	10.23310000000000000
2000-01-01	8.79987000000000000
2001-01-01	8.75187000000000000
2002-01-01	8.62253999999999900
2003-01-01	8.97386000000000000
2004-01-01	9.25935000000000000
2005-01-01	8.93883999999999900
2006-01-01	9.52157000000000000
2007-01-01	9.84173000000000000
2008-01-01	10.56170000000000000
2009-01-01	13.85550000000000000
2010-01-01	12.24130000000000000
2011-01-01	12.62890000000000000
2012-01-01	13.47090000000000000
2013-01-01	14.00800000000000000
2014-01-01	13.25140000000000000
2015-01-01	12.77990000000000000
2016-01-01	12.36310000000000000