Year	Percent
1960-01-01	76.94570000000000
1961-01-01	76.86990000000000
1962-01-01	76.56750000000000
1963-01-01	78.36690000000000
1964-01-01	81.16560000000000
1965-01-01	83.95820000000000
1966-01-01	85.65830000000000
1967-01-01	84.55770000000000
1968-01-01	84.35880000000000
1969-01-01	84.61800000000000
1970-01-01	83.58390000000000
1971-01-01	82.18799999999999
1972-01-01	80.94220000000000
1973-01-01	79.37680000000000
1974-01-01	78.92850000000000
1975-01-01	79.61970000000000
1976-01-01	83.00320000000000
1977-01-01	88.16170000000000
1978-01-01	87.23080000000000
1979-01-01	83.67660000000000
1980-01-01	82.07450000000000
1981-01-01	79.90360000000000
1982-01-01	80.37080000000000
1983-01-01	83.32150000000000
1984-01-01	84.83480000000000
1985-01-01	85.98870000000000
1986-01-01	87.56960000000000
1987-01-01	92.10760000000000
1988-01-01	104.76600000000000
1989-01-01	118.97600000000000
1990-01-01	118.97600000000000
1991-01-01	118.97600000000000
1992-01-01	118.97600000000000
1993-01-01	118.97600000000000
1994-01-01	118.97600000000000
1995-01-01	118.97600000000000
1996-01-01	118.97600000000000
1997-01-01	118.97600000000000
1998-01-01	118.97600000000000
1999-01-01	118.97600000000000
2000-01-01	118.97600000000000
2001-01-01	163.62200000000000
2002-01-01	230.42500000000000
2003-01-01	232.22900000000000
2004-01-01	236.91200000000000
2005-01-01	238.38600000000000
2006-01-01	234.30700000000002
2007-01-01	234.95400000000000
2008-01-01	233.58500000000000
2009-01-01	225.76100000000000
2010-01-01	218.36599999999999
2011-01-01	213.41800000000000
2012-01-01	212.12800000000000
2013-01-01	210.54800000000000
2014-01-01	205.52400000000000
2015-01-01	199.93099999999998
2016-01-01	193.27000000000000