Year	Percent of Total
1960-01-01	2.62287444386823
1961-01-01	2.61800695719622
1962-01-01	2.60417973800535
1963-01-01	2.58324489587836
1964-01-01	2.55773798484601
1965-01-01	2.52965345561458
1966-01-01	2.53224220028919
1967-01-01	2.52928970462683
1968-01-01	2.52149038541796
1969-01-01	2.50836953923255
1970-01-01	2.49059014610670
1971-01-01	2.50732717505784
1972-01-01	2.51752773521286
1973-01-01	2.52201548566131
1974-01-01	2.52247442292812
1975-01-01	2.51982847565814
1976-01-01	2.55744002476764
1977-01-01	2.59038423258790
1978-01-01	2.61804444369190
1979-01-01	2.63941073142796
1980-01-01	2.65450378944063
1981-01-01	2.69138961918412
1982-01-01	2.72230395001131
1983-01-01	2.74866219872322
1984-01-01	2.77209310312534
1985-01-01	2.79386769365239
1986-01-01	2.82915796647971
1987-01-01	2.86369275080448
1988-01-01	2.89711163909389
1989-01-01	2.92866304614797
1990-01-01	2.95839505893430
1991-01-01	2.99239260080006
1992-01-01	3.02112463378260
1993-01-01	3.04626234712294
1994-01-01	3.06987416726610
1995-01-01	3.09319980801696
1996-01-01	3.11781367599141
1997-01-01	3.13816257613743
1998-01-01	3.15485879597507
1999-01-01	3.16763800626522
2000-01-01	3.17643007139177
2001-01-01	3.18820953817441
2002-01-01	3.19361776597763
2003-01-01	3.19300271108866
2004-01-01	3.18615173644553
2005-01-01	3.17324290439849
2006-01-01	3.17297326249573
2007-01-01	3.16600998336050
2008-01-01	3.15214155539879
2009-01-01	3.13032107534453
2010-01-01	3.10081216429346
2011-01-01	3.08218009143735
2012-01-01	3.05683659365303
2013-01-01	3.03003048089562
2014-01-01	3.00814423869033
2015-01-01	2.99474647582819
2016-01-01	2.99879688136492
2017-01-01	3.00825831656369