Year	Percent of Total
1960-01-01	2.93453327860356
1961-01-01	2.92786684617265
1962-01-01	2.91612325039493
1963-01-01	2.89996980912931
1964-01-01	2.87964515692600
1965-01-01	2.85568417472933
1966-01-01	2.86072334710997
1967-01-01	2.86088735281894
1968-01-01	2.85708348818548
1969-01-01	2.85044830890784
1970-01-01	2.84207320013783
1971-01-01	2.85501558270212
1972-01-01	2.86323386113918
1973-01-01	2.86755104685784
1974-01-01	2.86853915342735
1975-01-01	2.86664420314816
1976-01-01	2.88049558490655
1977-01-01	2.88956616235455
1978-01-01	2.89471042577026
1979-01-01	2.89686836710820
1980-01-01	2.89713402603028
1981-01-01	2.91386650062790
1982-01-01	2.92483365194860
1983-01-01	2.93062360138449
1984-01-01	2.93160641525219
1985-01-01	2.92802242418763
1986-01-01	2.93908679134704
1987-01-01	2.94637873482512
1988-01-01	2.95022006428523
1989-01-01	2.95043176033449
1990-01-01	2.94678130005387
1991-01-01	2.95223769014606
1992-01-01	2.95471980014431
1993-01-01	2.95549768183965
1994-01-01	2.95702398942675
1995-01-01	2.96202419170577
1996-01-01	2.96965827696744
1997-01-01	2.97228304920545
1998-01-01	2.97086816259460
1999-01-01	2.96486388155891
2000-01-01	2.95349980872576
2001-01-01	2.96347064402451
2002-01-01	2.96819817482050
2003-01-01	2.96865931181636
2004-01-01	2.96625290046236
2005-01-01	2.96198407509598
2006-01-01	2.97282187536847
2007-01-01	2.98059511624261
2008-01-01	2.98583612892574
2009-01-01	2.98910092680698
2010-01-01	2.99104991016961
2011-01-01	3.00192178215184
2012-01-01	3.01061710631119
2013-01-01	3.01656431170253
2014-01-01	3.01885738019388
2015-01-01	3.01772969742923
2016-01-01	3.02046507149009
2017-01-01	3.01984185195602