Year	% of output
1960	11.56002695811071
1961	10.868309469673692
1962	10.579628912682958
1963	9.627431921466048
1964	9.345926263086026
1965	9.162165024891431
1966	8.674871458681922
1967	7.9690015146061
1968	7.800013492710869
1969	7.3210320638330355
1970	7.113237868396132
1971	7.332755044314539
1972	7.301927895455773
1973	7.462305325934454
1974	6.529015388698571
1975	6.954459224747307
1976	6.83258938151852
1977	6.778551934435273
1978	6.619453678277208
1979	6.491399009913969
1980	6.431587001954522
1981	6.638072406538977
1982	6.505285910468622
1983	6.530139603322359
1984	6.236047735669935
1985	6.4242367640460385
1986	6.448986333470545
1987	6.407916088885497
1988	6.060779240667306
1989	6.207293039733367
1990	6.161811907221111
1991	6.282656662626504
1992	6.323667436144696
1993	6.555550473994933
1994	6.116401601252242
1995	6.5562988713728165
1996	6.459824927052939
1997	6.3556013945602965
1998	6.386860002630549
1999	6.3480402929252975
2000	6.252610936568394
2001	6.3727339430601235
2002	6.51552626879656
2003	6.2788740861786225
2004	6.158648509589974
2005	6.248892368547284
2006	6.098138793415669
2007	5.940662225488333
2008	5.900065941504256
2009	5.840706534650019
2010	5.82359840342839
2011	5.701272535453556
2012	5.6142562435355465
2013	5.6088151877910635
2014	5.41234149650027