Year	% of output
1971	13.248542660307367
1972	14.170764416629414
1973	19.16190476190476
1974	11.412330564057717
1975	16.252886836027713
1976	18.071115440818314
1977	14.68279227668152
1978	7.206813714784888
1979	31.204205160879262
1980	29.06960524480402
1981	49.266975308641975
1982	24.285044538209092
1983	24.033054057155972
1984	42.2306322350846
1985	32.85392818706585
1986	27.596135983652236
1987	30.19973368841545
1988	32.409473142268745
1989	29.704206665105755
1990	38.41640050508801
1991	37.58029222841815
1992	38.57354725630309
1993	27.852464667356085
1994	34.32489858991694
1995	37.718357823043455
1996	41.47017176629933
1997	42.27213501271949
1998	40.75177023360466
1999	43.837404437814655
2000	38.147620017654646
2001	38.71426723580391
2002	37.53074959387329
2003	33.39278636543797
2004	31.081359423274975
2005	23.705340073919878
2006	31.07312851579403
2007	11.532770476107581
2008	9.422074846044529
2009	5.865399201092178
2010	17.21603307683473
2011	9.547236812902272
2012	8.656726816693375
2013	15.119620538032752
2014	16.1072721289898