Year	Percent
1976-01-01	95.61900000000000
1977-01-01	91.05110000000000
1978-01-01	78.79660000000000
1979-01-01	89.26390000000000
1980-01-01	87.36220000000000
1981-01-01	91.92360000000000
1982-01-01	103.08600000000000
1983-01-01	97.31200000000001
1984-01-01	91.92170000000000
1985-01-01	90.71070000000000
1986-01-01	82.54740000000000
1987-01-01	75.71740000000000
1988-01-01	84.48290000000000
1989-01-01	93.81910000000000
1990-01-01	94.54680000000000
1991-01-01	99.98090000000000
1992-01-01	104.25900000000000
1993-01-01	103.86300000000000
1994-01-01	102.33500000000000
1995-01-01	95.24500000000000
1996-01-01	91.18440000000000
1997-01-01	91.99090000000000
1998-01-01	95.30080000000000
1999-01-01	95.23560000000000
2000-01-01	88.49130000000000
2001-01-01	86.07170000000000
2002-01-01	91.81970000000000
2003-01-01	100.61900000000000
2004-01-01	103.43100000000000
2005-01-01	101.61300000000000
2006-01-01	99.31540000000000
2007-01-01	98.02560000000000
2008-01-01	96.20200000000001
2009-01-01	93.23680000000000
2010-01-01	90.92040000000000
2011-01-01	87.83260000000000
2012-01-01	82.14410000000000
2013-01-01	79.70200000000000
2014-01-01	79.29080000000000
2015-01-01	77.98240000000000
2016-01-01	76.67460000000000