Annual Percent of Total
1960-01-01 58.9935430972635
1961-01-01 58.9236076640524
1962-01-01 58.8178038405153
1963-01-01 58.6892497526337
1964-01-01 58.5917655426230
1965-01-01 58.5614035087719
1966-01-01 58.5050060841534
1967-01-01 58.5379563031508
1968-01-01 58.6204099017331
1969-01-01 58.6577445384767
1970-01-01 58.6086741863203
1971-01-01 58.3019211508695
1972-01-01 57.9698044945384
1973-01-01 57.7047628537266
1974-01-01 57.6327979497302
1975-01-01 57.8148989743905
1976-01-01 57.4729263402673
1977-01-01 57.5025278794183
1978-01-01 57.7478344562079
1979-01-01 58.0162510507145
1980-01-01 58.2283800914954
1981-01-01 58.5517077637961
1982-01-01 58.6961754479808
1983-01-01 58.8236457749497
1984-01-01 59.1363725043897
1985-01-01 59.6927850649434
1986-01-01 60.2079424936676
1987-01-01 60.9442246933851
1988-01-01 61.7932030045754
1989-01-01 62.5693088637251
1990-01-01 63.1744479848280
1991-01-01 63.7813566356175
1992-01-01 64.2010984368399
1993-01-01 64.4795820156744
1994-01-01 64.7103036550273
1995-01-01 64.9455780886270
1996-01-01 64.9065650356528
1997-01-01 64.9440452645019
1998-01-01 65.0161622098149
1999-01-01 65.0775234679886
2000-01-01 65.1215994663435
2001-01-01 65.2142462218946
2002-01-01 65.2839593284122
2003-01-01 65.3702238852399
2004-01-01 65.5142583765504
2005-01-01 65.7263436562578
2006-01-01 65.8992957895405
2007-01-01 66.0944742201067
2008-01-01 66.2991312052374
2009-01-01 66.4722548936394
2010-01-01 66.5774367921860
2011-01-01 66.8220390564563
2012-01-01 67.0134546510502
2013-01-01 67.1608964103113
2014-01-01 67.2926624406302
2015-01-01 67.4262610046415
2016-01-01 67.4600351331429
2017-01-01 67.5271035818356