Year	Percent
1964-01-01	67.52500000000000
1965-01-01	68.51830000000000
1966-01-01	70.49260000000000
1967-01-01	70.03399999999999
1968-01-01	60.80150000000000
1969-01-01	60.01200000000000
1970-01-01	64.41740000000000
1971-01-01	71.99300000000000
1972-01-01	76.18380000000000
1973-01-01	83.39290000000000
1974-01-01	83.39290000000000
1975-01-01	83.39290000000000
1976-01-01	201.32200000000000
1977-01-01	120.20800000000000
1978-01-01	145.04399999999998
1979-01-01	144.61800000000000
1980-01-01	154.14400000000000
1981-01-01	180.28200000000000
1982-01-01	312.33200000000000
1983-01-01	312.33200000000000
1984-01-01	312.33200000000000
1985-01-01	312.33200000000000
1986-01-01	312.33200000000000
1987-01-01	312.33200000000000
1988-01-01	128.67000000000000
1989-01-01	160.30000000000000
1990-01-01	145.92500000000000
1991-01-01	102.85200000000000
1992-01-01	84.11670000000000
1993-01-01	96.70180000000000
1994-01-01	108.12000000000000
1995-01-01	112.30600000000000
1996-01-01	120.75600000000000
1997-01-01	125.44100000000000
1998-01-01	137.59400000000000
1999-01-01	156.47200000000000
2000-01-01	174.77400000000000
2001-01-01	186.27700000000002
2002-01-01	185.34500000000000
2003-01-01	196.90599999999998
2004-01-01	204.00300000000000
2005-01-01	215.92200000000000
2006-01-01	224.13600000000000
2007-01-01	231.96800000000000
2008-01-01	216.50099999999998
2009-01-01	202.81599999999997
2010-01-01	216.26300000000000
2011-01-01	228.77800000000000
2012-01-01	222.97400000000002
2013-01-01	225.60800000000000
2014-01-01	234.64100000000000
2015-01-01	235.19500000000000
2016-01-01	243.03599999999997