Annual Percent of Total
1960-01-01 2.27104984238372
1961-01-01 2.30014809481525
1962-01-01 2.31223733444730
1963-01-01 2.31148374572025
1964-01-01 2.30431894460361
1965-01-01 2.29355063245221
1966-01-01 2.36767811260005
1967-01-01 2.43594729170854
1968-01-01 2.49552184070294
1969-01-01 2.54295381385919
1970-01-01 2.57725399622965
1971-01-01 2.66887582657378
1972-01-01 2.74925017787840
1973-01-01 2.81762677490299
1974-01-01 2.87404205925932
1975-01-01 2.91894300121038
1976-01-01 3.00750078864317
1977-01-01 3.08473823301081
1978-01-01 3.15042755436561
1979-01-01 3.20447737314562
1980-01-01 3.24685344096847
1981-01-01 3.33430877860659
1982-01-01 3.41225958544903
1983-01-01 3.47831308675282
1984-01-01 3.52987723539373
1985-01-01 3.56589578835961
1986-01-01 3.63768741914057
1987-01-01 3.69935488892949
1988-01-01 3.75090089781741
1989-01-01 3.79091190585846
1990-01-01 3.81732809714326
1991-01-01 3.80423539332037
1992-01-01 3.77957893219901
1993-01-01 3.74488000182747
1994-01-01 3.70183628707682
1995-01-01 3.65122417212854
1996-01-01 3.59345467752752
1997-01-01 3.52920390101180
1998-01-01 3.45871984286428
1999-01-01 3.38076110941741
2000-01-01 3.29533383966906
2001-01-01 3.22884680399580
2002-01-01 3.15266980320956
2003-01-01 3.07270359799579
2004-01-01 2.99603628368388
2005-01-01 2.92572024343290
2006-01-01 2.89436113713520
2007-01-01 2.86603752696590
2008-01-01 2.83538602041446
2009-01-01 2.79566828604911
2010-01-01 2.74503261507315
2011-01-01 2.71063186519211
2012-01-01 2.66602610036941
2013-01-01 2.61736717810574
2014-01-01 2.57213913278468
2015-01-01 2.53395584645096
2016-01-01 2.52532434720025
2017-01-01 2.51876552558033