Year	Percent
1973-01-01	56.38390000000000
1974-01-01	51.11910000000000
1975-01-01	42.50760000000000
1976-01-01	34.36560000000000
1977-01-01	31.26460000000000
1978-01-01	27.57290000000000
1979-01-01	25.97290000000000
1980-01-01	27.49550000000000
1981-01-01	30.89310000000000
1982-01-01	34.26850000000000
1983-01-01	40.70370000000000
1984-01-01	46.65430000000000
1985-01-01	50.27420000000000
1986-01-01	53.38890000000000
1987-01-01	57.83750000000000
1988-01-01	63.21360000000000
1989-01-01	68.59590000000000
1990-01-01	75.18010000000000
1991-01-01	80.14399999999999
1992-01-01	83.16960000000000
1993-01-01	90.11340000000000
1994-01-01	94.46880000000000
1995-01-01	90.56840000000000
1996-01-01	98.58610000000000
1997-01-01	106.53500000000000
1998-01-01	113.99100000000000
1999-01-01	122.07900000000000
2000-01-01	123.89399999999999
2001-01-01	131.28900000000000
2002-01-01	131.96000000000000
2003-01-01	125.12100000000001
2004-01-01	126.64200000000001
2005-01-01	124.73200000000001
2006-01-01	125.08800000000000
2007-01-01	125.70400000000000
2008-01-01	130.34300000000000
2009-01-01	144.51300000000000
2010-01-01	143.94200000000000
2011-01-01	145.34900000000000
2012-01-01	141.51100000000000
2013-01-01	132.15100000000000
2014-01-01	121.53399999999999
2015-01-01	110.80500000000000
2016-01-01	102.79700000000001