Year	Percent
1973-01-01	42.26860000000000
1974-01-01	45.29540000000000
1975-01-01	45.64430000000000
1976-01-01	45.34010000000000
1977-01-01	44.53240000000000
1978-01-01	46.93480000000000
1979-01-01	49.28610000000000
1980-01-01	49.87880000000000
1981-01-01	48.70690000000000
1982-01-01	50.19970000000000
1983-01-01	53.43450000000000
1984-01-01	54.67970000000000
1985-01-01	54.69980000000000
1986-01-01	54.32990000000000
1987-01-01	53.75510000000000
1988-01-01	52.46680000000000
1989-01-01	51.55780000000000
1990-01-01	52.58160000000000
1991-01-01	52.65080000000000
1992-01-01	51.38520000000000
1993-01-01	50.15610000000000
1994-01-01	50.15120000000000
1995-01-01	62.60460000000000
1996-01-01	75.76790000000000
1997-01-01	78.73450000000000
1998-01-01	84.79690000000000
1999-01-01	92.68780000000000
2000-01-01	99.58350000000000
2001-01-01	74.85720000000000
2002-01-01	73.82350000000000
2003-01-01	81.79350000000000
2004-01-01	95.69220000000000
2005-01-01	113.22200000000001
2006-01-01	132.13200000000000
2007-01-01	148.68400000000000
2008-01-01	169.94799999999998
2009-01-01	177.85400000000000
2010-01-01	167.97799999999998
2011-01-01	148.73500000000000
2012-01-01	138.66500000000000
2013-01-01	125.47700000000000
2014-01-01	99.75090000000000
2015-01-01	64.53490000000000
2016-01-01	56.07510000000000