Year	Percent of Total
1960-01-01	2.93721132587469
1961-01-01	2.95059962409692
1962-01-01	2.95461966419068
1963-01-01	2.95021502552556
1964-01-01	2.93858870512346
1965-01-01	2.92080849622257
1966-01-01	2.93648782837998
1967-01-01	2.94464035282608
1968-01-01	2.94612577904274
1969-01-01	2.94152157832603
1970-01-01	2.93162573917985
1971-01-01	2.95002714439525
1972-01-01	2.96031088163687
1973-01-01	2.96306764195871
1974-01-01	2.95888043699514
1975-01-01	2.94851611061157
1976-01-01	2.96430680364882
1977-01-01	2.97348259513418
1978-01-01	2.97733024737206
1979-01-01	2.97678712402414
1980-01-01	2.97250461118942
1981-01-01	2.98142655697158
1982-01-01	2.98407048178893
1983-01-01	2.98149939232544
1984-01-01	2.97474270901141
1985-01-01	2.96472214781707
1986-01-01	2.97868688770032
1987-01-01	2.98750911059824
1988-01-01	2.99176305438564
1989-01-01	2.99209360038995
1990-01-01	2.98933789575191
1991-01-01	3.00154333641078
1992-01-01	3.00854834616126
1993-01-01	3.01143583912140
1994-01-01	3.01144532314927
1995-01-01	3.00955584291014
1996-01-01	3.02059825063865
1997-01-01	3.02615544040829
1998-01-01	3.02648018122077
1999-01-01	3.02109344686404
2000-01-01	3.00989285926893
2001-01-01	3.01609393444172
2002-01-01	3.01543042445051
2003-01-01	3.00951649645718
2004-01-01	3.00010614024837
2005-01-01	2.98846281893341
2006-01-01	3.00198435108380
2007-01-01	3.01136411961288
2008-01-01	3.01684514425427
2009-01-01	3.01862125883927
2010-01-01	3.01749496391282
2011-01-01	3.02811141103735
2012-01-01	3.03516728537342
2013-01-01	3.04020261519270
2014-01-01	3.04483469928118
2015-01-01	3.05031341237372
2016-01-01	3.07004591792117
2017-01-01	3.08816542089877