Year	% of output
1971	21.653543307086615
1972	21.79261862917399
1973	21.534437663469923
1974	21.57856625633599
1975	21.581548599670512
1976	21.57293497363796
1977	21.5319449346982
1978	21.52839726434731
1979	21.566265060240962
1980	24.875
1981	30
1982	34.568781183178906
1983	38.62887277521424
1984	42.249657064471876
1985	45.482734319943624
1986	38.697878566203364
1987	23.15541601255887
1988	19.522803529265566
1989	19.91844804151736
1990	31.20267479594847
1991	27.98279158699809
1992	24.221581931406263
1993	24.168944537518737
1994	24.390452562238004
1995	23.241349102058695
1996	25.50885321860003
1997	26.88589540412044
1998	19.441159077468953
1999	20.28874852502256
2000	23.180175529168817
2001	23.791198559990068
2002	12.537790200216758
2003	12.537612838515546
2004	12.535134868583263
2005	12.535285815102329
2006	9.94586733457219
2007	13.516810246245331
2008	33.119374869183005
2009	36.4435518388042
2010	35.754653234228144
2011	31.528135697526828
2012	59.034281546316556
2013	61.48023105531084
2014	69.69600593676287