Year	% of output
1971	9.462915601023019
1972	13.47517730496454
1973	12.345679012345679
1974	12.524084778420038
1975	13.403880070546737
1976	13.071895424836603
1977	10.319767441860465
1978	17.25955204216074
1979	15.511163337250295
1980	14.90066225165563
1981	13.157894736842104
1982	18.33810888252149
1983	30.721830985915492
1984	16.834170854271356
1985	3.655913978494624
1986	6.313645621181263
1987	0.11129660545353368
1988	3.68474923234391
1989	10.670582476749878
1990	6.985769728331177
1991	14.45012787723785
1992	26.632522407170296
1993	30.015612802498048
1994	30.02141327623126
1995	25.29325513196481
1996	21.030322791000977
1997	25.127551020408163
1998	20.55636896046852
1999	21.1521675880128
2000	19.633077765607887
2001	21.807415036045313
2002	22.9176814417925
2003	22.663139329805997
2004	26.875515251442707
2005	24.64751026235945
2006	25.509181969949918
2007	21.562746645619573
2008	20.552756145976485
2009	22.505660377358492
2010	24.302788844621514
2011	26.99594930092774
2012	29.896640826873384
2013	31.29799355957394
2014	34.94650410549888