Year	Percent
1976-01-01	8.779250000000000
1977-01-01	10.996300000000000
1978-01-01	10.603500000000000
1979-01-01	8.995040000000000
1980-01-01	11.918400000000000
1981-01-01	11.178300000000000
1982-01-01	9.268369999999999
1983-01-01	9.702169999999999
1984-01-01	10.424300000000000
1985-01-01	10.341200000000000
1986-01-01	10.879600000000000
1987-01-01	12.011800000000000
1988-01-01	12.678600000000000
1989-01-01	12.930100000000000
1990-01-01	12.458400000000000
1991-01-01	12.549600000000000
1992-01-01	12.268300000000000
1993-01-01	13.603900000000000
1994-01-01	15.879200000000000
1995-01-01	15.946400000000000
1996-01-01	18.551400000000000
1997-01-01	19.749800000000000
1998-01-01	23.549800000000000
1999-01-01	24.729000000000000
2000-01-01	24.278900000000000
2001-01-01	25.490400000000000
2002-01-01	28.291200000000000
2003-01-01	26.527300000000000
2004-01-01	32.210500000000000
2005-01-01	36.484100000000000
2006-01-01	31.295100000000000
2007-01-01	32.743600000000000
2008-01-01	34.430500000000000
2009-01-01	38.457700000000000
2010-01-01	40.202300000000000
2011-01-01	38.671200000000000
2012-01-01	39.562700000000000
2013-01-01	38.190300000000000
2014-01-01	39.919800000000000
2015-01-01	42.347000000000000
2016-01-01	42.154100000000000