Year	% of output
1971	7.398568019093078
1972	7.422068283028203
1973	9.967992684042066
1974	8.453788874288218
1975	13.275968039336203
1976	11.260997067448681
1977	9.383995394358088
1978	11.154489682097044
1979	13.49911190053286
1980	14.677804295942721
1981	15.736342042755345
1982	12.791878172588833
1983	14.47435246317928
1984	16.778115501519757
1985	17.114914425427873
1986	16.840882694541232
1987	17.681940700808628
1988	19.8798470780994
1989	22.739877981142538
1990	14.564686737184704
1991	18.040508714083845
1992	10.977744436109028
1993	0
1994	10.848167539267015
1995	10.842340024017842
1996	10.814839350778403
1997	10.807354116706634
1998	9.907407407407408
1999	9.819942502647905
2000	8.522555252800485
2001	8.473557692307693
2002	8.91260455725411
2003	8.67618247970893
2004	10.128862408202854
2005	11.506332524925895
2006	12.578616352201259
2007	11.040693795863909
2008	23.778040141676506
2009	22.305593451568896
2010	20.87962962962963
2011	22.01099404489235
2012	25.94173782019086
2013	27.473077886301027
2014	26.7458777885548