Year	Percent
1970-01-01	85.62570000000000
1971-01-01	93.04640000000000
1972-01-01	100.86399999999999
1973-01-01	104.65400000000000
1974-01-01	105.21900000000000
1975-01-01	75.76540000000000
1976-01-01	68.91110000000000
1977-01-01	65.87240000000000
1978-01-01	70.25740000000000
1979-01-01	69.18850000000000
1980-01-01	70.43380000000000
1981-01-01	72.97880000000000
1982-01-01	73.12300000000000
1983-01-01	73.03470000000000
1984-01-01	67.51620000000000
1985-01-01	68.15640000000000
1986-01-01	75.13360000000000
1987-01-01	81.76670000000000
1988-01-01	81.12820000000000
1989-01-01	84.38660000000000
1990-01-01	87.19860000000000
1991-01-01	83.80630000000000
1992-01-01	85.75860000000000
1993-01-01	89.26050000000000
1994-01-01	85.71110000000000
1995-01-01	78.82330000000000
1996-01-01	77.55650000000000
1997-01-01	81.49790000000000
1998-01-01	86.00050000000000
1999-01-01	86.30910000000000
2000-01-01	85.46530000000000
2001-01-01	81.12880000000000
2002-01-01	73.69960000000000
2003-01-01	69.92440000000000
2004-01-01	65.22870000000000
2005-01-01	66.63520000000000
2006-01-01	75.80570000000000
2007-01-01	80.14980000000000
2008-01-01	82.96960000000000
2009-01-01	85.99660000000000
2010-01-01	87.81920000000000
2011-01-01	89.62430000000000
2012-01-01	93.23250000000000
2013-01-01	91.61740000000000
2014-01-01	82.66430000000000
2015-01-01	74.01840000000000
2016-01-01	68.42080000000000