Year	Percent
1973-01-01	10.8112000000000000
1974-01-01	13.7072000000000000
1975-01-01	15.6270000000000000
1976-01-01	13.4057000000000000
1977-01-01	12.0746000000000000
1978-01-01	12.9423000000000000
1979-01-01	15.7758000000000000
1980-01-01	16.9873000000000000
1981-01-01	19.2952000000000000
1982-01-01	20.1429000000000000
1983-01-01	19.8570000000000000
1984-01-01	22.1106000000000000
1985-01-01	20.5284000000000000
1986-01-01	20.7258000000000000
1987-01-01	19.7388000000000000
1988-01-01	18.9943000000000000
1989-01-01	16.8369000000000000
1990-01-01	15.3067000000000000
1991-01-01	14.0975000000000000
1992-01-01	14.3789000000000000
1993-01-01	12.5077000000000000
1994-01-01	9.9513600000000010
1995-01-01	8.1238500000000000
1996-01-01	5.9522200000000000
1997-01-01	5.5218900000000000
1998-01-01	5.0235400000000010
1999-01-01	5.1511000000000000
2000-01-01	5.7948100000000000
2001-01-01	6.1971900000000000
2002-01-01	6.2914500000000000
2003-01-01	6.3281800000000010
2004-01-01	7.1791399999999990
2005-01-01	7.5598399999999994
2006-01-01	8.6429500000000000
2007-01-01	9.7171300000000010
2008-01-01	10.6945000000000000
2009-01-01	12.3715000000000000
2010-01-01	12.9857000000000000
2011-01-01	14.0958000000000000
2012-01-01	14.5958000000000000
2013-01-01	15.6884000000000000
2014-01-01	16.1611000000000000
2015-01-01	18.7120000000000000
2016-01-01	20.0457000000000000