Year	Percent
1960-01-01	101.645
1961-01-01	100.510
1962-01-01	100.935
1963-01-01	99.820
1964-01-01	100.880
1965-01-01	98.305
1966-01-01	95.895
1967-01-01	91.870
1968-01-01	89.290
1969-01-01	89.985
1970-01-01	92.990
1971-01-01	91.110
1972-01-01	87.430
1973-01-01	90.420
1974-01-01	90.825
1975-01-01	89.215
1976-01-01	88.890
1977-01-01	88.410
1978-01-01	92.150
1979-01-01	92.650
1980-01-01	89.430
1981-01-01	89.020
1982-01-01	91.130
1983-01-01	91.130
1984-01-01	84.830
1985-01-01	85.495
1986-01-01	83.955
1987-01-01	83.390
1988-01-01	85.020
1989-01-01	86.580
1990-01-01	88.020
1991-01-01	86.090
1992-01-01	83.755
1993-01-01	80.960
1994-01-01	76.285
1995-01-01	76.700
1996-01-01	79.245
1997-01-01	81.640
1998-01-01	85.635
1999-01-01	84.930
2000-01-01	84.170
2001-01-01	77.915
2002-01-01	75.320
2003-01-01	75.410
2004-01-01	77.040
2005-01-01	79.070
2006-01-01	81.250
2007-01-01	82.765
2008-01-01	86.690
2009-01-01	88.580
2010-01-01	85.840
2011-01-01	87.245
2012-01-01	88.550
2013-01-01	88.555
2014-01-01	87.320
2015-01-01	85.460