Year	Percent
1970-01-01	111.643999999999990
1971-01-01	90.100500000000000
1972-01-01	79.290800000000000
1973-01-01	68.110800000000000
1974-01-01	53.350800000000000
1975-01-01	55.373000000000005
1976-01-01	45.403999999999996
1977-01-01	41.066100000000000
1978-01-01	36.271400000000000
1979-01-01	35.302800000000000
1980-01-01	32.087300000000000
1981-01-01	32.828900000000000
1982-01-01	31.243800000000000
1983-01-01	29.837400000000000
1984-01-01	29.824500000000000
1985-01-01	30.991400000000000
1986-01-01	34.553100000000000
1987-01-01	35.772900000000000
1988-01-01	38.810200000000000
1989-01-01	40.091200000000000
1990-01-01	41.485800000000000
1991-01-01	41.096200000000000
1992-01-01	42.374600000000000
1993-01-01	48.612800000000000
1994-01-01	54.919500000000000
1995-01-01	58.953100000000000
1996-01-01	60.757000000000000
1997-01-01	62.362100000000000
1998-01-01	61.261000000000000
1999-01-01	64.128200000000000
2000-01-01	67.928600000000000
2001-01-01	76.947900000000000
2002-01-01	82.654900000000000
2003-01-01	81.870100000000000
2004-01-01	91.537700000000000
2005-01-01	82.691900000000000
2006-01-01	80.529000000000000
2007-01-01	79.284800000000000
2008-01-01	80.787900000000000
2009-01-01	88.970600000000000
2010-01-01	94.441800000000000
2011-01-01	94.442600000000000
2012-01-01	89.169900000000000
2013-01-01	83.567300000000000
2014-01-01	81.066400000000000
2015-01-01	78.513300000000000
2016-01-01	79.010400000000000