Annual Percent of Total
1960-01-01 52.1477604146767
1961-01-01 53.0942236400014
1962-01-01 53.9255919159889
1963-01-01 54.5956514705900
1964-01-01 55.1452217733355
1965-01-01 55.6705970536065
1966-01-01 55.7139396949642
1967-01-01 55.9766531440855
1968-01-01 56.3445818202626
1969-01-01 56.6959105565293
1970-01-01 56.9706488314259
1971-01-01 57.6775574104752
1972-01-01 58.3813359508752
1973-01-01 59.0232936387760
1974-01-01 59.5950724386224
1975-01-01 60.1138993808081
1976-01-01 60.2476417623905
1977-01-01 60.2990503650947
1978-01-01 60.3488620475377
1979-01-01 60.4319797335765
1980-01-01 60.5432618359925
1981-01-01 60.7096181051054
1982-01-01 60.8956541448459
1983-01-01 61.1293310521254
1984-01-01 61.4127499094479
1985-01-01 61.7373346244553
1986-01-01 62.0397232957453
1987-01-01 62.3383922077119
1988-01-01 62.6237376754050
1989-01-01 62.8801163300952
1990-01-01 63.1002778587114
1991-01-01 63.3696429230088
1992-01-01 63.6104915692747
1993-01-01 63.8279783123444
1994-01-01 64.0402557874257
1995-01-01 64.2594225291837
1996-01-01 64.3867810387049
1997-01-01 64.5609510460690
1998-01-01 64.7688611468970
1999-01-01 64.9662029670613
2000-01-01 65.1210423450024
2001-01-01 65.2167539889792
2002-01-01 65.2919578043155
2003-01-01 65.3643734744940
2004-01-01 65.4624732447312
2005-01-01 65.5918270547159
2006-01-01 65.6944278374579
2007-01-01 65.8249712035860
2008-01-01 65.9996766411798
2009-01-01 66.2042099856400
2010-01-01 66.4076909230867
2011-01-01 66.4682933619352
2012-01-01 66.5425673468240
2013-01-01 66.6346049838928
2014-01-01 66.7361096960781
2015-01-01 66.8284913853176
2016-01-01 66.8812397710627
2017-01-01 66.8950960257769