Year	% of output
1971	4.25531914893617
1972	4.25531914893617
1973	4.081632653061225
1974	4.166666666666666
1975	2
1976	3.8461538461538463
1977	3.9215686274509802
1978	3.9215686274509802
1979	3.7037037037037033
1980	3.7037037037037033
1981	3.571428571428571
1982	3.389830508474576
1983	3.278688524590164
1984	3.278688524590164
1985	3.1746031746031744
1986	3.076923076923077
1987	11.428571428571429
1988	10.81081081081081
1989	4.938271604938271
1990	6.329113924050633
1991	5.434782608695652
1992	3.0303030303030303
1993	2.912621359223301
1994	2.8301886792452833
1995	2.7777777777777777
1996	2.727272727272727
1997	2.7027027027027026
1998	3.4482758620689653
1999	3.3333333333333335
2000	3.2
2001	3.1746031746031744
2002	3.10077519379845
2003	2.9850746268656714
2004	2.941176470588235
2005	2.7586206896551726
2006	3.3112582781456954
2007	3.225806451612903
2008	3.0120481927710845
2009	2.8735632183908044
2010	2.824858757062147
2011	2.923976608187134
2012	2.840909090909091
2013	3.1746031746031744
2014	3.0303030303030303