Year	% of output
1971	8.823529411764707
1972	11.48936170212766
1973	13.716814159292035
1974	13.292682926829269
1975	14.17233560090703
1976	14.383561643835616
1977	14.100346020761245
1978	12.214411247803165
1979	13.472070098576122
1980	15.124378109452735
1981	13.78640776699029
1982	15.06986027944112
1983	19.70387243735763
1984	13.704496788008566
1985	14.437984496124031
1986	15.50712489522213
1987	15.884194053208137
1988	15
1989	16.677357280307888
1990	16.815374056280028
1991	21.366954213669544
1992	21.53752287980476
1993	22.247838616714695
1994	26.746849942726232
1995	27.008086253369274
1996	26.191670847967885
1997	25.330073349633253
1998	26.301853486319505
1999	27.008310249307478
2000	30.45512547851978
2001	30.51587301587302
2002	30.15267175572519
2003	29.545454545454547
2004	27.960301163586585
2005	27.04031465093412
2006	26.96234843650287
2007	22.100997506234414
2008	21.27343052662898
2009	20.561830292499277
2010	18.474993167532112
2011	17.625523012552303
2012	15.926569089555942
2013	15.434469515122421
2014	20.82771030139451