Year	% of output
1971	0
1972	0
1973	0
1974	0
1975	0
1976	10.237203495630462
1977	10.187932739861523
1978	10.081541882876206
1979	10.065425264217414
1980	10.05794701986755
1981	10.627493652520856
1982	9.218698921216085
1983	8.992583436341162
1984	8.41987089531294
1985	5.4444163079260575
1986	4.641940751108001
1987	4.946187313945501
1988	6.9904181184668985
1989	4.974048442906574
1990	5.1888750518887505
1991	5.642903295283222
1992	5.433727925480303
1993	5.8493299529156095
1994	6.190885640584694
1995	7.730923694779117
1996	5.961977186311787
1997	5.997961857621196
1998	6.476237379955677
1999	6.943150046598323
2000	6.930151083862492
2001	6.974173449904532
2002	6.983546617915905
2003	6.968031968031968
2004	6.922088717599939
2005	7.078355098638511
2006	7.107728337236534
2007	7.131846675572912
2008	7.078090303478904
2009	6.279493335541021
2010	6.278425241614554
2011	6.231695411649853
2012	6.232213183085635
2013	6.227645090573439
2014	6.0503463248216685