Annual Percent of Total
1960-01-01 50.5467117867355
1961-01-01 50.4444037975583
1962-01-01 50.3742169060378
1963-01-01 50.3431885284613
1964-01-01 50.3888476794881
1965-01-01 50.5407406495861
1966-01-01 50.6645806909645
1967-01-01 50.8942140462057
1968-01-01 51.2286434064477
1969-01-01 51.6387196531685
1970-01-01 52.1013917686978
1971-01-01 52.3273426619802
1972-01-01 52.5699443734984
1973-01-01 52.8393746522453
1974-01-01 53.1409522258108
1975-01-01 53.4707156584905
1976-01-01 53.6969904923017
1977-01-01 53.9409246407976
1978-01-01 54.1923553060574
1979-01-01 54.4348604900794
1980-01-01 54.6536490695197
1981-01-01 54.7581970448299
1982-01-01 54.8613122103733
1983-01-01 54.9400893860876
1984-01-01 55.0003793736240
1985-01-01 55.0759087749198
1986-01-01 55.1929739956467
1987-01-01 55.3266259704519
1988-01-01 55.4845679835677
1989-01-01 55.6595362061128
1990-01-01 55.8364273569520
1991-01-01 56.0199693455170
1992-01-01 56.1963436764199
1993-01-01 56.3998703441773
1994-01-01 56.6609844831791
1995-01-01 56.9784043905962
1996-01-01 57.1310797355346
1997-01-01 57.3526862244969
1998-01-01 57.6055529432349
1999-01-01 57.8446182970070
2000-01-01 58.0606109131671
2001-01-01 58.5646490136765
2002-01-01 58.9947994805224
2003-01-01 59.3804878578038
2004-01-01 59.7481921203887
2005-01-01 60.0983154789825
2006-01-01 60.2324600711596
2007-01-01 60.3556408719515
2008-01-01 60.4763100660039
2009-01-01 60.6137617130600
2010-01-01 60.7794798280712
2011-01-01 60.7539913920231
2012-01-01 60.8207736510122
2013-01-01 60.9281931444392
2014-01-01 61.0184955020928
2015-01-01 61.0748643307062
2016-01-01 61.2163778949943
2017-01-01 61.3048293785145