Year	Percent
1973-01-01	38.79850000000000
1974-01-01	38.46480000000000
1975-01-01	40.77460000000000
1976-01-01	41.16560000000000
1977-01-01	41.97230000000000
1978-01-01	42.10450000000000
1979-01-01	41.26230000000000
1980-01-01	42.30220000000000
1981-01-01	43.66010000000000
1982-01-01	45.81990000000000
1983-01-01	48.88360000000000
1984-01-01	51.25760000000000
1985-01-01	55.21220000000000
1986-01-01	59.03030000000000
1987-01-01	63.51640000000000
1988-01-01	68.68800000000000
1989-01-01	74.37630000000000
1990-01-01	79.95490000000000
1991-01-01	89.98590000000000
1992-01-01	91.28530000000000
1993-01-01	84.51290000000000
1994-01-01	73.08360000000000
1995-01-01	65.34890000000000
1996-01-01	63.42010000000000
1997-01-01	57.36500000000000
1998-01-01	54.27500000000000
1999-01-01	57.21750000000000
2000-01-01	57.28790000000000
2001-01-01	59.35190000000000
2002-01-01	59.71340000000000
2003-01-01	62.35380000000000
2004-01-01	64.77440000000000
2005-01-01	69.32790000000000
2006-01-01	73.78420000000000
2007-01-01	76.12340000000000
2008-01-01	81.72980000000000
2009-01-01	90.42700000000000
2010-01-01	91.18600000000000
2011-01-01	93.35150000000000
2012-01-01	97.39620000000000
2013-01-01	99.00800000000000
2014-01-01	100.82799999999999
2015-01-01	101.66300000000000
2016-01-01	101.83300000000000