Year	% of output
1960	9.592796834595134
1961	9.18839181867181
1962	8.976466961257836
1963	9.224415990616754
1964	9.256011189804845
1965	9.251318246168367
1966	8.889350924280802
1967	8.338556902075497
1968	8.338808146522025
1969	8.339971088886923
1970	8.808871851040525
1971	8.019118804649217
1972	8.250673365793018
1973	8.357618276668466
1974	8.73199040982321
1975	8.587220414277597
1976	8.936596767603827
1977	8.50301667620408
1978	8.534370836762921
1979	8.49391417360226
1980	9.054872688330164
1981	8.853169485143914
1982	8.610677489853263
1983	8.512280230841498
1984	9.056599780612803
1985	9.171733955137917
1986	9.148212435492093
1987	9.397327410028508
1988	9.365137941565713
1989	8.981590102138176
1990	8.445313343023809
1991	8.917888551303133
1992	9.572581027375412
1993	10.624270349521808
1994	11.303375368028448
1995	11.50177785174986
1996	12.320852528248949
1997	12.601461589497076
1998	13.408913383497707
1999	13.291004263431777
2000	13.398103334345365
2001	13.638843650119446
2002	13.727531006962302
2003	13.295209056736141
2004	12.759165500642112
2005	12.438215617427796
2006	11.704610212280963
2007	11.426759453398507
2008	11.280263118275377
2009	11.5240177669703
2010	10.890961548221863
2011	10.645527045257895
2012	10.758278355821819
2013	10.903168015763052
2014	10.575720875724981