Annual Percent of Total
1960-01-01 48.8953294357223
1961-01-01 48.9946900878910
1962-01-01 49.0214362972408
1963-01-01 49.0135338272828
1964-01-01 49.0267466693786
1965-01-01 49.0917650570581
1966-01-01 49.3150101194235
1967-01-01 49.5728914710196
1968-01-01 49.8459526794195
1969-01-01 50.1164320478694
1970-01-01 50.3878976891047
1971-01-01 50.7663017347839
1972-01-01 51.1790749859728
1973-01-01 51.5899436197674
1974-01-01 51.9527097806775
1975-01-01 52.2491169711376
1976-01-01 52.7093239716087
1977-01-01 53.0280458203807
1978-01-01 53.2563912522085
1979-01-01 53.4644893717268
1980-01-01 53.6806230212254
1981-01-01 53.8526270871441
1982-01-01 54.0710109753739
1983-01-01 54.2918171973918
1984-01-01 54.4573445687929
1985-01-01 54.5509781781599
1986-01-01 54.5682458110792
1987-01-01 54.5718421304585
1988-01-01 54.5722675461798
1989-01-01 54.5940932929588
1990-01-01 54.6552684051373
1991-01-01 54.7155370413632
1992-01-01 54.8095126802047
1993-01-01 54.9522424746284
1994-01-01 55.1577057656854
1995-01-01 55.4285894325593
1996-01-01 55.7152225124387
1997-01-01 56.0502246431170
1998-01-01 56.4323650946789
1999-01-01 56.8617629961649
2000-01-01 57.3367529748996
2001-01-01 57.7678788094012
2002-01-01 58.2766871721383
2003-01-01 58.8297862855411
2004-01-01 59.3763565660426
2005-01-01 59.8893209103486
2006-01-01 60.3927282197105
2007-01-01 60.8049668136568
2008-01-01 61.1682558812737
2009-01-01 61.5456808005827
2010-01-01 61.9609857006830
2011-01-01 62.3265371557933
2012-01-01 62.7543277633202
2013-01-01 63.1944526071262
2014-01-01 63.5700206208726
2015-01-01 63.8457301337723
2016-01-01 64.0841579300160
2017-01-01 64.2228345056749