Year	Percent
1971-01-01	8.638639999999999
1972-01-01	9.096300000000000
1973-01-01	8.908780000000000
1974-01-01	8.993560000000000
1975-01-01	9.308810000000001
1976-01-01	9.663190000000000
1977-01-01	10.002100000000000
1978-01-01	10.115100000000000
1979-01-01	10.323800000000000
1980-01-01	10.988500000000000
1981-01-01	11.574500000000000
1982-01-01	12.296600000000000
1983-01-01	13.033100000000000
1984-01-01	13.341400000000000
1985-01-01	13.449100000000000
1986-01-01	14.103500000000000
1987-01-01	15.539400000000000
1988-01-01	17.092800000000000
1989-01-01	18.924700000000000
1990-01-01	20.642700000000000
1991-01-01	22.304600000000000
1992-01-01	24.050800000000000
1993-01-01	26.097900000000000
1994-01-01	28.021100000000000
1995-01-01	29.688500000000000
1996-01-01	30.917100000000000
1997-01-01	42.696500000000000
1998-01-01	56.351500000000000
1999-01-01	61.253000000000000
2000-01-01	63.198100000000000
2001-01-01	161.688000000000000
2002-01-01	165.558000000000000
2003-01-01	168.828000000000000
2004-01-01	166.148000000000000
2005-01-01	162.292000000000000
2006-01-01	156.804000000000000
2007-01-01	147.205000000000000
2008-01-01	143.323999999999980
2009-01-01	146.119000000000000
2010-01-01	142.024000000000000
2011-01-01	142.620000000000000
2012-01-01	141.757000000000000
2013-01-01	140.947000000000000
2014-01-01	141.696000000000000
2015-01-01	139.219000000000000
2016-01-01	135.311000000000000