Year	% of output
1971	9.401076716016151
1972	9.402035623409668
1973	9.402895054282268
1974	9.397935779816514
1975	9.398907103825136
1976	9.401483050847457
1977	9.398766700924973
1978	9.401197604790418
1979	9.393792434529583
1980	9.429245283018869
1981	9.444444444444445
1982	9.499105545617173
1983	9.51176983435048
1984	9.443027210884354
1985	9.43824701195219
1986	10
1987	9.961685823754788
1988	9.4336917562724
1989	9.345890410958905
1990	9.346570397111913
1991	9.346007604562738
1992	13.157894736842104
1993	13.158371040723981
1994	13.515151515151516
1995	13.88695652173913
1996	14.28638497652582
1997	14.709844559585491
1998	15.482352941176469
1999	15.333333333333332
2000	15.804123711340207
2001	15.806930693069306
2002	15.807038834951456
2003	15.806267263548909
2004	15.805761616529376
2005	15.803945530726256
2006	15.805660797860485
2007	15.806346698880267
2008	15.806938159879335
2009	15.809154162919487
2010	15.80963810930576
2011	15.811921356496411
2012	15.814098565190267
2013	15.813877372899848
2014	15.813278239991066