Year	Percent of Total
1960-01-01	3.19849728705898
1961-01-01	3.19101262497489
1962-01-01	3.17041754987373
1963-01-01	3.13616672988242
1964-01-01	3.09197901380593
1965-01-01	3.03677491514965
1966-01-01	3.04665260689055
1967-01-01	3.04404415068297
1968-01-01	3.03842230533832
1969-01-01	3.02762676134472
1970-01-01	3.01537899797439
1971-01-01	3.05313581425479
1972-01-01	3.08775889815453
1973-01-01	3.11373910764594
1974-01-01	3.12909829510923
1975-01-01	3.13381787088499
1976-01-01	3.16296488477287
1977-01-01	3.18557448350852
1978-01-01	3.20094615432922
1979-01-01	3.21099221037698
1980-01-01	3.21639611602546
1981-01-01	3.23734438266280
1982-01-01	3.24487835911741
1983-01-01	3.24282347900600
1984-01-01	3.23360330683772
1985-01-01	3.21385051373766
1986-01-01	3.21330927384077
1987-01-01	3.20692200268682
1988-01-01	3.19205697450530
1989-01-01	3.17191816471153
1990-01-01	3.14630436789652
1991-01-01	3.14434546278122
1992-01-01	3.13508138426571
1993-01-01	3.12281592079666
1994-01-01	3.10549735331846
1995-01-01	3.08480965262498
1996-01-01	3.08476608947111
1997-01-01	3.07698131099924
1998-01-01	3.06605741338999
1999-01-01	3.05116025776783
2000-01-01	3.03582326770006
2001-01-01	3.03838183231154
2002-01-01	3.03610844298034
2003-01-01	3.02892092227341
2004-01-01	3.01610105353399
2005-01-01	2.99855957961307
2006-01-01	3.00243444945524
2007-01-01	3.00052990866868
2008-01-01	2.99302069750422
2009-01-01	2.97630010753774
2010-01-01	2.95001246933414
2011-01-01	2.94012332836567
2012-01-01	2.92249415639315
2013-01-01	2.90330411328388
2014-01-01	2.89194545586231
2015-01-01	2.89327316882422
2016-01-01	2.92420446932570
2017-01-01	2.96285102074917