Year	Percent
1973-01-01	37.47060000000000
1974-01-01	36.37550000000000
1975-01-01	35.95060000000000
1976-01-01	38.90000000000000
1977-01-01	43.03940000000000
1978-01-01	44.18810000000000
1979-01-01	45.03910000000000
1980-01-01	45.52240000000000
1981-01-01	45.86450000000000
1982-01-01	45.74470000000000
1983-01-01	45.40550000000000
1984-01-01	48.25300000000000
1985-01-01	54.64210000000000
1986-01-01	64.87650000000000
1987-01-01	71.38360000000000
1988-01-01	76.22430000000000
1989-01-01	75.99260000000000
1990-01-01	75.33880000000000
1991-01-01	70.34880000000000
1992-01-01	66.36350000000000
1993-01-01	65.03650000000000
1994-01-01	63.59120000000000
1995-01-01	62.19100000000000
1996-01-01	62.43630000000000
1997-01-01	65.77100000000000
1998-01-01	74.18880000000000
1999-01-01	73.23880000000000
2000-01-01	65.09820000000000
2001-01-01	69.03390000000000
2002-01-01	73.01990000000000
2003-01-01	75.84680000000000
2004-01-01	74.89160000000000
2005-01-01	76.36030000000000
2006-01-01	81.10350000000000
2007-01-01	94.58730000000000
2008-01-01	105.82900000000000
2009-01-01	124.93799999999999
2010-01-01	123.59700000000001
2011-01-01	119.92100000000000
2012-01-01	117.60000000000000
2013-01-01	119.02700000000000
2014-01-01	121.38200000000000
2015-01-01	128.73700000000000
2016-01-01	135.99100000000000