Year	Percent
1973-01-01	4.1983900000000000
1974-01-01	4.9294900000000000
1975-01-01	5.1024900000000000
1976-01-01	4.3497300000000000
1977-01-01	4.3942100000000000
1978-01-01	5.3006400000000005
1979-01-01	4.6691000000000000
1980-01-01	4.4300700000000000
1981-01-01	5.1379900000000000
1982-01-01	5.9174200000000000
1983-01-01	6.1427600000000000
1984-01-01	6.6717500000000000
1985-01-01	7.7728500000000000
1986-01-01	8.9224500000000000
1987-01-01	9.5082500000000000
1988-01-01	11.0079000000000000
1989-01-01	11.4257000000000000
1990-01-01	10.4482000000000000
1991-01-01	8.3882300000000000
1992-01-01	7.4797600000000010
1993-01-01	8.2214400000000000
1994-01-01	8.2214400000000000
1995-01-01	9.7558300000000000
1996-01-01	8.0139000000000000
1997-01-01	7.4981300000000010
1998-01-01	9.2527600000000000
1999-01-01	10.5549000000000000
2000-01-01	10.6060000000000000
2001-01-01	10.8208000000000000
2002-01-01	11.4694000000000000
2003-01-01	10.8330000000000000
2004-01-01	11.3138000000000000
2005-01-01	11.9865000000000000
2006-01-01	12.4295000000000000
2007-01-01	13.4483000000000000
2008-01-01	13.9075000000000000
2009-01-01	13.1313000000000000
2010-01-01	12.9093000000000000
2011-01-01	15.3105000000000000
2012-01-01	18.0605000000000000
2013-01-01	20.3653000000000000
2014-01-01	22.3753000000000000
2015-01-01	24.2161000000000000
2016-01-01	24.1947000000000000