Year	Percent
1975-01-01	1.0030299999999999
1976-01-01	0.9216310000000000
1977-01-01	0.9063319999999999
1978-01-01	0.9396650000000000
1979-01-01	0.8909180000000000
1980-01-01	0.8933350000000000
1981-01-01	0.9011969999999999
1982-01-01	0.9043570000000000
1983-01-01	0.9683510000000001
1984-01-01	0.9308820000000000
1985-01-01	0.9423299999999999
1986-01-01	0.9103310000000000
1987-01-01	0.8490290000000000
1988-01-01	0.8764740000000000
1989-01-01	1.6575500000000000
1990-01-01	1.7357599999999997
1991-01-01	1.8770500000000000
1992-01-01	1.8961400000000002
1993-01-01	2.0275600000000000
1994-01-01	1.8736700000000002
1995-01-01	1.7048599999999998
1996-01-01	1.7582700000000000
1997-01-01	1.6988599999999998
1998-01-01	1.6132700000000000
1999-01-01	1.7166900000000000
2000-01-01	1.6832799999999999
2001-01-01	1.6537600000000000
2002-01-01	1.7499600000000000
2003-01-01	1.8098299999999998
2004-01-01	1.7679900000000002
2005-01-01	1.7780799999999999
2006-01-01	1.7730099999999998
2007-01-01	1.9061099999999997
2008-01-01	2.0206500000000000
2009-01-01	2.1955100000000000
2010-01-01	2.1405300000000000
2011-01-01	2.0997100000000000
2012-01-01	2.1341799999999997
2013-01-01	2.1545600000000000
2014-01-01	2.1528600000000000
2015-01-01	2.1697700000000000
2016-01-01	2.1657200000000000
2017-01-01	2.1335100000000000