Year	% of output
1971	29.673590504451035
1972	30.46757164404223
1973	36.661466458658346
1974	38.152610441767074
1975	39.569536423841065
1976	38.80171184022825
1977	36.72316384180791
1978	32.19178082191781
1979	36.12244897959184
1980	39.17748917748918
1981	78.44827586206897
1982	8.215962441314554
1983	12.470023980815348
1984	15.829145728643216
1985	24.727272727272727
1986	19.032258064516128
1987	20.535714285714285
1988	23.44213649851632
1989	17.16101694915254
1990	15.859030837004406
1991	6.369426751592357
1992	14.663461538461538
1993	21.93877551020408
1994	50.12658227848101
1995	47.794117647058826
1996	72.05882352941177
1997	31.343283582089555
1998	10.372960372960373
1999	2.749675745784695
2000	10.09694719471947
2001	10.610012620950778
2002	10.612020138451857
2003	12.72577243971761
2004	14.008878265323544
2005	12.26194956718103
2006	14.080206283504104
2007	14.49987559094302
2008	14.834402062537185
2009	14.40193362023227
2010	14.742589703588143
2011	14.592988710635769
2012	14.789661084003692
2013	17.771064115474992
2014	14.720468890892697