Year	% of output
1971	9.325201652567381
1972	10.845188284518828
1973	9.20958255630469
1974	9.655172413793103
1975	9.57345971563981
1976	10.248320781599837
1977	8.697986577181208
1978	7.652132626414497
1979	9.610949936770066
1980	9.829474559822543
1981	10.716377122779623
1982	9.859829878998443
1983	10.707467119219347
1984	10.730593607305936
1985	11.528126896073502
1986	9.754420034793867
1987	10.348317743962026
1988	10.208230655495317
1989	9.968988932256858
1990	10.562296269467584
1991	10.774135697917703
1992	10.317349119058461
1993	8.15051965871276
1994	9.647779479326186
1995	8.122822571581983
1996	8.431468578170566
1997	8.653165425954134
1998	8.687202949407009
1999	8.320838747653795
2000	7.908144659658044
2001	9.200351493848856
2002	7.261519268344142
2003	7.31046391356009
2004	7.938628934119163
2005	8.105327654939218
2006	8.058122270112872
2007	6.464032138821856
2008	6.07355554651147
2009	5.913985740663369
2010	6.344579431050263
2011	6.944631421043522
2012	5.695003835826621
2013	6.067469794680108
2014	6.111201261069127