Year	Percent
1976-01-01	116.58800000000000
1977-01-01	110.96700000000001
1978-01-01	97.99170000000000
1979-01-01	74.79950000000000
1980-01-01	61.11730000000000
1981-01-01	49.04270000000000
1982-01-01	55.41620000000000
1983-01-01	66.31740000000000
1984-01-01	63.74700000000000
1985-01-01	77.98160000000000
1986-01-01	98.29520000000000
1987-01-01	97.26660000000000
1988-01-01	87.27770000000000
1989-01-01	103.52000000000000
1990-01-01	115.09200000000001
1991-01-01	104.24000000000000
1992-01-01	96.02540000000000
1993-01-01	93.55360000000000
1994-01-01	86.23760000000000
1995-01-01	89.52090000000000
1996-01-01	96.83010000000000
1997-01-01	94.72490000000000
1998-01-01	94.49270000000000
1999-01-01	90.47740000000000
2000-01-01	82.55200000000000
2001-01-01	87.46230000000000
2002-01-01	91.73260000000000
2003-01-01	85.88670000000000
2004-01-01	83.80220000000000
2005-01-01	87.62510000000000
2006-01-01	84.49390000000000
2007-01-01	85.22930000000000
2008-01-01	86.23210000000000
2009-01-01	86.21720000000000
2010-01-01	80.00490000000000
2011-01-01	73.99250000000000
2012-01-01	71.97720000000000
2013-01-01	66.50520000000000
2014-01-01	64.23430000000000
2015-01-01	67.61140000000000
2016-01-01	70.10860000000000