Year	Percent
1973-01-01	0.1427790000000000
1974-01-01	0.1492240000000000
1975-01-01	0.0732120000000000
1976-01-01	0.0728710000000000
1977-01-01	3.5458900000000000
1978-01-01	3.7013100000000000
1979-01-01	5.4926300000000000
1980-01-01	6.0853900000000000
1981-01-01	7.6747000000000000
1982-01-01	10.5837000000000000
1983-01-01	10.4250000000000000
1984-01-01	10.6847000000000000
1985-01-01	11.6696000000000000
1986-01-01	11.3792000000000000
1987-01-01	11.2732000000000000
1988-01-01	11.4655000000000000
1989-01-01	12.0497000000000000
1990-01-01	12.1058000000000000
1991-01-01	13.0322000000000000
1992-01-01	13.6839000000000000
1993-01-01	14.7126000000000000
1994-01-01	17.7104000000000000
1995-01-01	17.7756000000000000
1996-01-01	15.4403000000000000
1997-01-01	15.4403000000000000
1998-01-01	14.7088000000000000
1999-01-01	11.7791000000000000
2000-01-01	13.3791000000000000
2001-01-01	11.1728000000000000
2002-01-01	11.4815000000000000
2003-01-01	8.5312300000000000
2004-01-01	5.0170900000000005
2005-01-01	5.9625200000000000
2006-01-01	6.9892600000000010
2007-01-01	7.3919000000000000
2008-01-01	8.1342400000000000
2009-01-01	9.5607500000000000
2010-01-01	10.4323000000000000
2011-01-01	11.1774000000000000
2012-01-01	13.7964000000000000
2013-01-01	16.0687000000000000
2014-01-01	17.2074000000000000
2015-01-01	17.2425000000000000
2016-01-01	16.7408000000000000