Year	% of output
1971	11.914893617021278
1972	11.153846153846155
1973	6.084656084656085
1974	10.36468330134357
1975	11.129848229342327
1976	11.092715231788079
1977	14.010507880910684
1978	11.795774647887324
1979	10.419681620839363
1980	5.736636245110821
1981	10.11378002528445
1982	19.515669515669515
1983	19.572953736654807
1984	9.090909090909092
1985	4.573245292247493
1986	1.511081262592344
1987	1.5485536079148294
1988	1.5009005403241946
1989	8.100110960424116
1990	0.30531543130402794
1991	0.03747742836700624
1992	0.15843189270844846
1993	1.5110064893752386
1994	1.4992997775764068
1995	1.5768165352652888
1996	0.17399839386097973
1997	2.315979867882982
1998	2.7258612896252186
1999	2.820858187415817
2000	2.669558064757347
2001	3.210715625482711
2002	3.237783124533311
2003	3.637171389387881
2004	4.240241859390345
2005	4.628073329945667
2006	4.945708760969805
2007	5.060958585388553
2008	5.253858358574932
2009	5.696974107971397
2010	6.231272888691599
2011	5.957483731019523
2012	6.383331949863036
2013	5.78327619615442
2014	6.5789949712383775