Year	% of output
1960	16.696914700544465
1961	14.759535655058043
1962	14.97584541062802
1963	15.701219512195122
1964	14.684287812041116
1965	15.634218289085549
1966	15.929203539823009
1967	17.847025495750707
1968	17.28395061728395
1969	15.443592552026287
1970	11.088709677419354
1971	6.9386694386694385
1972	6.757072714519523
1973	6.358036956089807
1974	6.411012782694199
1975	6.078467489408731
1976	7.043393782383419
1977	6.997582136253733
1978	6.669282071400549
1979	6.774586983035813
1980	6.79669618867549
1981	6.759825327510917
1982	6.488336915850649
1983	6.594143506445123
1984	5.357632980183345
1985	5.2775767600537575
1986	4.290380771293452
1987	6.026081634574643
1988	5.7064007834060355
1989	5.443234836702955
1990	5.9722758887171565
1991	6.4616689111676395
1992	6.437747276901285
1993	7.330250669262594
1994	7.828835399951374
1995	8.735385349558578
1996	9.113238298556114
1997	7.807694860505763
1998	8.765153071707417
1999	8.062012418404713
2000	7.607292062286366
2001	8.172796263864566
2002	7.719377318586832
2003	7.1547367231273515
2004	6.875985573545255
2005	7.6219724024846105
2006	7.493133550824619
2007	7.378491702592571
2008	8.438841552441762
2009	8.208882697852214
2010	7.476229966635167
2011	6.795533219534058
2012	6.628481642869541
2013	6.727373116800028
2014	6.2015828132581525