Year	Percent
1973-01-01	20.440900000000000
1974-01-01	21.769700000000000
1975-01-01	22.617800000000000
1976-01-01	23.703300000000000
1977-01-01	26.101900000000000
1978-01-01	37.802900000000000
1979-01-01	47.060700000000000
1980-01-01	47.045100000000000
1981-01-01	49.585000000000000
1982-01-01	50.698100000000000
1983-01-01	53.427800000000000
1984-01-01	52.929200000000000
1985-01-01	53.497600000000000
1986-01-01	56.515800000000000
1987-01-01	60.026100000000000
1988-01-01	58.720200000000000
1989-01-01	60.733999999999995
1990-01-01	61.230000000000000
1991-01-01	55.815600000000000
1992-01-01	55.257100000000000
1993-01-01	58.180800000000000
1994-01-01	57.635500000000000
1995-01-01	57.457500000000000
1996-01-01	58.498600000000000
1997-01-01	57.269600000000000
1998-01-01	56.951400000000000
1999-01-01	60.261700000000000
2000-01-01	68.516800000000000
2001-01-01	78.360100000000000
2002-01-01	77.459600000000000
2003-01-01	75.763600000000000
2004-01-01	75.645300000000000
2005-01-01	85.441100000000000
2006-01-01	89.987800000000000
2007-01-01	93.784500000000000
2008-01-01	100.842000000000010
2009-01-01	105.393999999999990
2010-01-01	125.170000000000000
2011-01-01	148.696000000000000
2012-01-01	144.212000000000020
2013-01-01	133.551000000000020
2014-01-01	130.510000000000000
2015-01-01	128.235000000000000
2016-01-01	122.387000000000000