Year	Percent
1973-01-01	56.88160000000000
1974-01-01	56.88160000000000
1975-01-01	56.88160000000000
1976-01-01	172.33200000000000
1977-01-01	96.12820000000000
1978-01-01	110.79000000000000
1979-01-01	112.49900000000000
1980-01-01	115.31900000000000
1981-01-01	129.94299999999998
1982-01-01	247.02599999999998
1983-01-01	247.02599999999998
1984-01-01	247.02599999999998
1985-01-01	247.02599999999998
1986-01-01	247.02599999999998
1987-01-01	247.02599999999998
1988-01-01	59.83140000000000
1989-01-01	91.74590000000000
1990-01-01	93.08260000000000
1991-01-01	66.76170000000000
1992-01-01	58.86390000000000
1993-01-01	67.87890000000000
1994-01-01	80.42980000000000
1995-01-01	91.46320000000000
1996-01-01	105.34200000000001
1997-01-01	110.22100000000000
1998-01-01	124.57900000000000
1999-01-01	151.38500000000000
2000-01-01	169.89700000000002
2001-01-01	171.11500000000000
2002-01-01	164.63299999999998
2003-01-01	156.77200000000002
2004-01-01	144.33200000000000
2005-01-01	149.20200000000000
2006-01-01	154.60900000000000
2007-01-01	157.84100000000000
2008-01-01	149.66899999999998
2009-01-01	139.19000000000000
2010-01-01	145.48100000000000
2011-01-01	153.72700000000000
2012-01-01	151.07900000000000
2013-01-01	160.16800000000000
2014-01-01	171.22200000000000
2015-01-01	169.51700000000000
2016-01-01	168.08900000000003