Year	Percent
1975-01-01	33.70220000000000
1976-01-01	35.80800000000000
1977-01-01	37.01230000000000
1978-01-01	34.90420000000000
1979-01-01	33.76560000000000
1980-01-01	34.37850000000000
1981-01-01	35.48710000000000
1982-01-01	32.59200000000000
1983-01-01	34.91480000000000
1984-01-01	36.61770000000000
1985-01-01	38.52150000000000
1986-01-01	46.17260000000000
1987-01-01	38.95280000000000
1988-01-01	29.43480000000000
1989-01-01	27.69830000000000
1990-01-01	25.58810000000000
1991-01-01	36.50510000000000
1992-01-01	50.00080000000000
1993-01-01	51.26030000000000
1994-01-01	51.11090000000000
1995-01-01	50.28300000000000
1996-01-01	46.97700000000000
1997-01-01	48.92910000000000
1998-01-01	55.05580000000000
1999-01-01	53.66850000000000
2000-01-01	47.65990000000000
2001-01-01	47.65990000000000
2002-01-01	47.65990000000000
2003-01-01	47.65990000000000
2004-01-01	53.15450000000000
2005-01-01	48.54430000000000
2006-01-01	56.40520000000000
2007-01-01	71.34530000000000
2008-01-01	85.94590000000000
2009-01-01	114.07799999999999
2010-01-01	103.59600000000000
2011-01-01	96.15440000000000
2012-01-01	96.38240000000000
2013-01-01	96.19630000000000
2014-01-01	95.10640000000000
2015-01-01	104.72800000000000