Year	% of output
1971	5.81270182992465
1972	12.516170763260027
1973	11.634063832916604
1974	11.872486220765678
1975	12.780116800217304
1976	12.677070828331333
1977	12.343716889171434
1978	12.198649951783992
1979	10.987079194866837
1980	11.13661548203261
1981	11.277460126391814
1982	12.313638873550524
1983	12.570595736928404
1984	11.926554302935594
1985	11.736869474778992
1986	11.851817247500701
1987	3.929082792891434
1988	4.513548488294576
1989	11.713753152297066
1990	11.424424631971803
1991	10.78378973182004
1992	10.877474432062337
1993	11.596662030598052
1994	15.15910705605205
1995	14.769307923771313
1996	14.25356866605724
1997	13.888409051649681
1998	11.834357195149122
1999	12.756797070987863
2000	12.932877980275126
2001	12.157745436605822
2002	12.333158477589322
2003	12.501056070292037
2004	12.541742971022298
2005	12.753894567111388
2006	12.036149882176243
2007	12.885089340727049
2008	12.649365689319367
2009	13.159661262005576
2010	12.678771459087713
2011	13.66728035184617
2012	14.650911337658327
2013	14.214209101588438
2014	12.493422536270014