Year	Percent
1960-01-01	61.51120000000000
1961-01-01	60.53220000000000
1962-01-01	59.67010000000000
1963-01-01	60.54140000000000
1964-01-01	65.63060000000000
1965-01-01	68.43500000000000
1966-01-01	65.67520000000000
1967-01-01	62.89430000000000
1968-01-01	61.94160000000000
1969-01-01	61.62800000000000
1970-01-01	60.16370000000000
1971-01-01	63.97120000000000
1972-01-01	73.30950000000000
1973-01-01	76.24900000000000
1974-01-01	71.98970000000000
1975-01-01	68.67360000000000
1976-01-01	69.49920000000000
1977-01-01	75.54660000000000
1978-01-01	80.55960000000000
1979-01-01	82.63520000000000
1980-01-01	81.59280000000000
1981-01-01	79.97420000000000
1982-01-01	90.66600000000000
1983-01-01	105.97700000000000
1984-01-01	108.20700000000001
1985-01-01	106.16200000000000
1986-01-01	110.22700000000000
1987-01-01	111.87600000000000
1988-01-01	112.60799999999999
1989-01-01	122.90100000000001
1990-01-01	125.85700000000001
1991-01-01	118.18500000000000
1992-01-01	113.95700000000001
1993-01-01	103.02200000000000
1994-01-01	94.63680000000000
1995-01-01	102.14700000000000
1996-01-01	106.60100000000000
1997-01-01	111.49300000000000
1998-01-01	118.14800000000000
1999-01-01	127.72000000000000
2000-01-01	134.83100000000002
2001-01-01	104.33700000000000
2002-01-01	108.37899999999999
2003-01-01	116.35000000000000
2004-01-01	131.57900000000000
2005-01-01	152.00799999999998
2006-01-01	158.78200000000000
2007-01-01	160.69700000000000
2008-01-01	165.42700000000002
2009-01-01	160.26700000000000
2010-01-01	142.78400000000000
2011-01-01	125.45100000000001
2012-01-01	119.59700000000001
2013-01-01	111.68500000000000
2014-01-01	99.22850000000000
2015-01-01	83.23260000000000
2016-01-01	69.11110000000000