Annual Percent of Total
1960-01-01 56.6640469243801
1961-01-01 56.3028635709137
1962-01-01 56.2875983252064
1963-01-01 56.4903507092392
1964-01-01 56.7785188857445
1965-01-01 57.1306194262144
1966-01-01 57.1586346281894
1967-01-01 57.4724241803734
1968-01-01 58.0038935198788
1969-01-01 58.6467043441302
1970-01-01 59.3300426117293
1971-01-01 60.1496662247142
1972-01-01 60.8438511051664
1973-01-01 61.5127317738222
1974-01-01 62.2936264343712
1975-01-01 63.2190447502149
1976-01-01 64.1549611793668
1977-01-01 65.3092561472188
1978-01-01 66.5128556230208
1979-01-01 67.5522829963335
1980-01-01 68.3431096170516
1981-01-01 68.7487551010977
1982-01-01 68.9649717722066
1983-01-01 69.0419899103226
1984-01-01 69.0883751942932
1985-01-01 69.1631779095635
1986-01-01 69.4428462478779
1987-01-01 69.7309474350554
1988-01-01 70.0010392729296
1989-01-01 70.2291242961099
1990-01-01 70.4205115006437
1991-01-01 70.6712984157396
1992-01-01 70.8521243007395
1993-01-01 70.9978766093605
1994-01-01 71.1539192011476
1995-01-01 71.3348852079143
1996-01-01 71.4064990763897
1997-01-01 71.5962790668406
1998-01-01 71.8107162430435
1999-01-01 71.9835235283067
2000-01-01 72.1244230267658
2001-01-01 72.4060761292330
2002-01-01 72.6324215832228
2003-01-01 72.8438080485999
2004-01-01 73.0937170024918
2005-01-01 73.3972967126412
2006-01-01 73.8479348653776
2007-01-01 74.2892587944707
2008-01-01 74.6884691101553
2009-01-01 74.9755988310351
2010-01-01 75.0919152578972
2011-01-01 75.0787842591407
2012-01-01 74.9587238206017
2013-01-01 74.6920608328574
2014-01-01 74.2413403010023
2015-01-01 73.6033959999178
2016-01-01 73.0221230279769
2017-01-01 72.2082754064118