Year	% of output
1960	9.39281617347757
1961	9.16317067785383
1962	8.891730706657745
1963	8.727850623779576
1964	8.605215765626246
1965	8.660439192226281
1966	8.718805371389056
1967	8.429324090381646
1968	8.330526122901395
1969	7.957679148525961
1970	8.016835902014426
1971	7.8343397074085575
1972	7.960281336404902
1973	7.789407184613983
1974	7.490048329013113
1975	7.9663662359156255
1976	7.955335005318712
1977	7.673611055076889
1978	7.769021650530522
1979	7.549495354638428
1980	7.669259566717764
1981	6.93655755799219
1982	7.266956898320151
1983	7.458421558277362
1984	6.661307821201394
1985	6.883505151298114
1986	6.484760078393896
1987	5.880605638715884
1988	5.751912512496971
1989	7.902010681922299
1990	7.547362851546791
1991	6.548137342055876
1992	6.5897806886546375
1993	6.8607369027915786
1994	6.695763985817124
1995	6.7471788280525224
1996	6.802236225734608
1997	6.2445268904885
1998	6.413990752476282
1999	6.239862557389903
2000	6.35589363322333
2001	5.832607502521517
2002	6.492523444595898
2003	6.1223753565773915
2004	6.396313463892804
2005	6.356428800065293
2006	6.247427179794776
2007	6.126904992611706
2008	6.017985422168125
2009	6.270145462388028
2010	6.075002268065344
2011	6.088829787799123
2012	6.186867402077575
2013	6.099582423515535
2014	6.026833989175543