Year	Percent
1960-01-01	41.59520000000000
1961-01-01	42.35230000000000
1962-01-01	42.20410000000000
1963-01-01	42.50660000000000
1964-01-01	43.10710000000000
1965-01-01	43.47910000000000
1966-01-01	42.49240000000000
1967-01-01	43.15570000000000
1968-01-01	43.80550000000000
1969-01-01	43.11890000000000
1970-01-01	43.15730000000000
1971-01-01	44.01480000000000
1972-01-01	45.40490000000000
1973-01-01	44.00830000000000
1974-01-01	41.40410000000000
1975-01-01	40.33600000000000
1976-01-01	41.14790000000000
1977-01-01	41.09430000000000
1978-01-01	40.32420000000000
1979-01-01	41.52350000000000
1980-01-01	44.68340000000000
1981-01-01	44.74620000000000
1982-01-01	48.60990000000000
1983-01-01	52.18970000000000
1984-01-01	53.62890000000000
1985-01-01	58.07750000000000
1986-01-01	65.68910000000000
1987-01-01	71.10450000000000
1988-01-01	71.78399999999999
1989-01-01	75.11470000000000
1990-01-01	79.42580000000000
1991-01-01	85.42500000000000
1992-01-01	90.80000000000000
1993-01-01	95.57799999999999
1994-01-01	96.69830000000000
1995-01-01	101.15700000000001
1996-01-01	107.71600000000001
1997-01-01	113.81200000000001
1998-01-01	122.95600000000000
1999-01-01	133.37100000000000
2000-01-01	133.53600000000000
2001-01-01	133.63100000000000
2002-01-01	132.14500000000000
2003-01-01	133.84200000000000
2004-01-01	141.23600000000000
2005-01-01	143.81799999999998
2006-01-01	148.12900000000000
2007-01-01	153.66400000000000
2008-01-01	155.14900000000000
2009-01-01	157.63900000000000
2010-01-01	159.81300000000000
2011-01-01	158.22200000000000
2012-01-01	156.31500000000000
2013-01-01	161.99900000000000
2014-01-01	166.63400000000001
2015-01-01	159.02600000000000
2016-01-01	154.53200000000000