Year	% of output
1971	5.139289145052834
1972	5.491329479768786
1973	5.595116988809766
1974	5.139186295503212
1975	9.516202647193063
1976	14.240362811791382
1977	9.933254809579898
1978	8.785897071367643
1979	10.00732690194163
1980	6.5959319381967525
1981	13.988868274582561
1982	11.342367525522606
1983	9.104859335038364
1984	5.395692430557289
1985	9.094807158493376
1986	1.563614993913445
1987	5.81490727532097
1988	8.068654195895038
1989	6.833695434444291
1990	5.758004854930066
1991	6.585507559687073
1992	7.531329845479985
1993	7.415421792618629
1994	6.234960925022891
1995	6.088138503362426
1996	6.490693672488479
1997	7.461923270042586
1998	5.565200701429905
1999	4.763265134646893
2000	7.235856756821009
2001	5.6668137918652235
2002	6.934018174634532
2003	4.576470588235295
2004	8.085691946833464
2005	10.548817878313006
2006	7.604969300131177
2007	8.234707534048862
2008	8.67384916748286
2009	8.275674629863369
2010	8.909179520717133
2011	9.400304706150505
2012	8.752944640753828
2013	7.047817560216465
2014	6.781139554723128