Year	Percent
1960-01-01	47.33950000000000
1961-01-01	51.66410000000000
1962-01-01	56.59980000000000
1963-01-01	58.72580000000000
1964-01-01	42.34590000000000
1965-01-01	32.14420000000000
1966-01-01	33.79260000000000
1967-01-01	37.28740000000000
1968-01-01	38.38610000000000
1969-01-01	40.40050000000000
1970-01-01	40.70220000000000
1971-01-01	46.79570000000000
1972-01-01	51.69150000000000
1973-01-01	57.19870000000000
1974-01-01	63.96630000000000
1975-01-01	85.01850000000000
1976-01-01	85.13930000000000
1977-01-01	93.08440000000000
1978-01-01	98.53890000000000
1979-01-01	105.06500000000000
1980-01-01	109.62600000000000
1981-01-01	120.28000000000000
1982-01-01	121.30799999999999
1983-01-01	121.71300000000000
1984-01-01	122.28800000000000
1985-01-01	139.03200000000000
1986-01-01	153.96600000000000
1987-01-01	183.16700000000000
1988-01-01	220.98400000000000
1989-01-01	238.79900000000000
1990-01-01	249.20500000000000
1991-01-01	238.08300000000000
1992-01-01	255.34400000000002
1993-01-01	255.34400000000002
1994-01-01	282.79600000000000
1995-01-01	275.60100000000000
1996-01-01	279.04600000000000
1997-01-01	300.99300000000000
1998-01-01	300.99300000000000
1999-01-01	300.99300000000000
2000-01-01	289.54100000000000
2001-01-01	338.44199999999995
2002-01-01	330.81699999999995
2003-01-01	335.67400000000004
2004-01-01	342.06400000000000
2005-01-01	369.23199999999997
2006-01-01	393.29100000000000
2007-01-01	422.09300000000000
2008-01-01	472.04900000000004
2009-01-01	434.35900000000004
2010-01-01	342.80000000000000
2011-01-01	333.76500000000000
2012-01-01	330.28500000000000
2013-01-01	327.16700000000003
2014-01-01	348.16200000000000
2015-01-01	380.38800000000003
2016-01-01	399.88699999999994