Annual Percent of Total
1960-01-01 56.3756828922131
1961-01-01 56.0981243712129
1962-01-01 55.7603124392828
1963-01-01 55.4426956179619
1964-01-01 55.2462974995770
1965-01-01 55.2045618555388
1966-01-01 55.0077609681378
1967-01-01 54.9960763550829
1968-01-01 55.1016691058473
1969-01-01 55.2321465452463
1970-01-01 55.3463292842634
1971-01-01 55.3434817954048
1972-01-01 55.3718035147923
1973-01-01 55.4333558692961
1974-01-01 55.5523830643452
1975-01-01 55.7429893220901
1976-01-01 55.9043305133136
1977-01-01 56.1371066764466
1978-01-01 56.4302780915110
1979-01-01 56.7632961560402
1980-01-01 57.1171966239821
1981-01-01 57.4348738131874
1982-01-01 57.7514448216861
1983-01-01 58.0676005959883
1984-01-01 58.3835628089483
1985-01-01 58.6929373357471
1986-01-01 58.8435078728978
1987-01-01 59.0128740379236
1988-01-01 59.1895039876635
1989-01-01 59.3717271247673
1990-01-01 59.5628906903584
1991-01-01 59.6313914713175
1992-01-01 59.7859841710536
1993-01-01 59.9979159107170
1994-01-01 60.2335996995599
1995-01-01 60.4811088531754
1996-01-01 60.8009948704964
1997-01-01 61.0845594982869
1998-01-01 61.3725748056307
1999-01-01 61.7169692237894
2000-01-01 62.1306976543100
2001-01-01 62.4643748551296
2002-01-01 62.8633555369855
2003-01-01 63.2990778132110
2004-01-01 63.7216056151618
2005-01-01 64.1025163002084
2006-01-01 64.3789620951506
2007-01-01 64.6328751956181
2008-01-01 64.8543081224902
2009-01-01 65.0422156800109
2010-01-01 65.1968536838333
2011-01-01 65.2850660008900
2012-01-01 65.3503590000900
2013-01-01 65.3925567611347
2014-01-01 65.4133530842537
2015-01-01 65.4151122196177
2016-01-01 65.3623154372075
2017-01-01 65.3048533956161