Annual Percent of Total
1960-01-01 49.8900944980641
1961-01-01 49.8009377419163
1962-01-01 49.6091499692446
1963-01-01 49.4186344855532
1964-01-01 49.3730908875370
1965-01-01 49.5252221708574
1966-01-01 49.6190185612876
1967-01-01 49.8879856545602
1968-01-01 50.2685530881667
1969-01-01 50.6607212894438
1970-01-01 51.0136105205544
1971-01-01 51.3011391397071
1972-01-01 51.5741903842807
1973-01-01 51.8386626666751
1974-01-01 52.1128924633326
1975-01-01 52.4045647616895
1976-01-01 52.6407300897080
1977-01-01 52.8819722864428
1978-01-01 53.1324855086581
1979-01-01 53.3969438128273
1980-01-01 53.6758553838296
1981-01-01 53.9052322303709
1982-01-01 54.1687324202069
1983-01-01 54.4479973416789
1984-01-01 54.7192102488835
1985-01-01 54.9711278594545
1986-01-01 55.1576666304925
1987-01-01 55.3232982823135
1988-01-01 55.4874199180715
1989-01-01 55.6809031918155
1990-01-01 55.9188409486069
1991-01-01 56.0989426621106
1992-01-01 56.3391996795844
1993-01-01 56.6152125437735
1994-01-01 56.8917978030146
1995-01-01 57.1532030566308
1996-01-01 57.3821691922277
1997-01-01 57.5870073295522
1998-01-01 57.7886781474661
1999-01-01 58.0114009922368
2000-01-01 58.2605845511327
2001-01-01 58.4613266137214
2002-01-01 58.6804980722062
2003-01-01 58.9115378399983
2004-01-01 59.1594881122884
2005-01-01 59.4489685257952
2006-01-01 59.8436040215686
2007-01-01 60.2896650136533
2008-01-01 60.8161051105242
2009-01-01 61.3956867619967
2010-01-01 61.9610666868786
2011-01-01 62.2464087699629
2012-01-01 62.5290737341757
2013-01-01 62.7829285948181
2014-01-01 63.0027892779911
2015-01-01 63.1989068739671
2016-01-01 63.3477481300805
2017-01-01 63.4816055076870