Annual Percent of Total
1960-01-01 44.6277406365062
1961-01-01 45.2053589106188
1962-01-01 45.7169540854003
1963-01-01 46.1782246062592
1964-01-01 46.6639947687051
1965-01-01 47.2212415110797
1966-01-01 47.5475322074764
1967-01-01 47.9970259326615
1968-01-01 48.6187845303867
1969-01-01 49.3571713593320
1970-01-01 50.0777649769585
1971-01-01 49.4126577474144
1972-01-01 48.7633272274670
1973-01-01 48.0821841326559
1974-01-01 47.3777319131685
1975-01-01 46.6798458581202
1976-01-01 46.1072944392490
1977-01-01 45.5495386906081
1978-01-01 44.9924047980724
1979-01-01 44.4199845214550
1980-01-01 43.8378804444557
1981-01-01 42.9319196615215
1982-01-01 42.1397560130082
1983-01-01 41.4836239204823
1984-01-01 40.9992929909696
1985-01-01 40.6809156923856
1986-01-01 39.4350756886619
1987-01-01 38.4381152983195
1988-01-01 37.6551114705728
1989-01-01 37.0369825531790
1990-01-01 36.5437637949126
1991-01-01 36.0748023630811
1992-01-01 35.7421173154835
1993-01-01 35.4884547069272
1994-01-01 35.2461668743589
1995-01-01 34.9834063273578
1996-01-01 34.6319561890956
1997-01-01 34.1739141945647
1998-01-01 33.6173074035631
1999-01-01 32.9711545897456
2000-01-01 32.2493293999962
2001-01-01 31.4771809369952
2002-01-01 30.6053341512115
2003-01-01 29.6565262497437
2004-01-01 28.6802546671515
2005-01-01 27.7172385990202
2006-01-01 26.6881087257492
2007-01-01 25.7543876428674
2008-01-01 24.8676279399598
2009-01-01 24.0033445989405
2010-01-01 23.1672267933712
2011-01-01 22.4095678586221
2012-01-01 21.7044642091115
2013-01-01 21.0269839462598
2014-01-01 20.3705908026822
2015-01-01 19.7442524519486
2016-01-01 19.3185967474651
2017-01-01 18.8834962313525