Year	% of output
1971	6.990990990990991
1972	6.756147320949211
1973	6.740233192004846
1974	7.507189344634479
1975	7.865486620179987
1976	8.675975211499395
1977	8.905731880625297
1978	8.811361836896278
1979	8.814846056516238
1980	8.870195341792453
1981	11.051939513477976
1982	10.138191026423401
1983	9.706067959919757
1984	9.849121579566674
1985	11.43019714161395
1986	8.3847819508687
1987	9.401401991849887
1988	9.999360590141647
1989	9.59402405452188
1990	9.376640479680052
1991	9.66165110438919
1992	9.003797461555402
1993	9.770673427911841
1994	10.242147052678012
1995	10.24924103960363
1996	9.882866001730962
1997	10.4630418075167
1998	9.940590714820743
1999	10.100642531866669
2000	11.71274320123123
2001	11.391791734875268
2002	11.290253155112746
2003	10.478838656698823
2004	11.418643600453427
2005	12.87430108773582
2006	12.371218733274258
2007	13.170122711189554
2008	13.855640153155434
2009	13.720323065364388
2010	12.691678487487186
2011	12.547608723676039
2012	13.617755118530642
2013	13.353733292287757
2014	13.490630673342661