Year	% of output
1971	8.798895536125173
1972	8.568045335363275
1973	8.886901374095455
1974	8.893372652491076
1975	8.587029695564366
1976	8.362609354549837
1977	8.3948520284837
1978	8.547174701918092
1979	8.686101050881671
1980	8.458957279511194
1981	8.327835574727228
1982	8.460759493670885
1983	8.70424292845258
1984	8.56269113149847
1985	7.751196172248803
1986	7.412870327447426
1987	7.797768359138482
1988	8.136226213764894
1989	7.995726495726496
1990	7.6832568537474994
1991	8.070565928857015
1992	9.323347107438016
1993	6.321743470304442
1994	6.441982873752848
1995	6.599061601331921
1996	6.313349571776539
1997	8.458068893944837
1998	8.091092802735893
1999	6.511296922255827
2000	5.701668939541529
2001	4.162481165243596
2002	3.439711908605489
2003	6.257664751823404
2004	4.32698621142482
2005	5.380836948201072
2006	4.476656746984096
2007	5.177111716621254
2008	3.4874826147426985
2009	3.017091708785061
2010	3.1168074570346636
2011	1.8205599547511313
2012	4.497317142050268
2013	2.665357368310304
2014	2.456902902607927