Year	% of output
1971	1.7543859649122806
1972	2.2388059701492535
1973	1.8181818181818181
1974	1.5544041450777202
1975	1.5810276679841897
1976	1.2195121951219512
1977	0.9029345372460496
1978	0.9174311926605505
1979	0.7692307692307693
1980	0.7547169811320755
1981	0.8403361344537815
1982	1.0494752623688157
1983	0.823045267489712
1984	1.0062893081761006
1985	1.0452961672473868
1986	1.1261261261261262
1987	1.3407821229050279
1988	1.4285714285714286
1989	11.986301369863012
1990	10.736196319018406
1991	10.152284263959391
1992	10.574018126888216
1993	10.61061061061061
1994	24.015009380863038
1995	26.514486391571555
1996	22.15815485996705
1997	22.13375796178344
1998	19.955323901712585
1999	18.44879518072289
2000	17.79467680608365
2001	19.54513148542999
2002	19.50067476383266
2003	19.491525423728813
2004	19.480519480519483
2005	19.05972045743329
2006	18.7987987987988
2007	17.647058823529413
2008	18.166849615806804
2009	19.432314410480352
2010	19.483204134366925
2011	19.79421852033317
2012	19.454713493530498
2013	23.18702290076336
2014	27.77777777777778