Year	% of output
1971	31.06796116504854
1972	31.06796116504854
1973	25.783475783475783
1974	23.95093608779858
1975	25.568531038721577
1976	28.7167891464104
1977	29.317476732161325
1978	25.597115817936007
1979	30.849292256452955
1980	35.31661708457289
1981	29.86476333583772
1982	28.590250329380762
1983	26.099621322458493
1984	27.710539586485122
1985	32.840106007067135
1986	26.354166666666668
1987	32.53982459280472
1988	36.187127350558015
1989	28.404778636683066
1990	33.574754267977234
1991	35.62273276904474
1992	26.65842140769058
1993	19.46556593525961
1994	18.100981193785774
1995	16.620396076253932
1996	15.983963744117135
1997	15.137459942654749
1998	15.416860735910573
1999	15.820069204152249
2000	15.325597615877243
2001	13.874195032198713
2002	12.708277524779
2003	11.520900974025974
2004	8.256694891220679
2005	7.43373539531894
2006	6.020791710406014
2007	5.166908563134978
2008	12.481734759483313
2009	11.273098959033812
2010	10.54179946065212
2011	10.191832944533779
2012	11.85494831349615
2013	13.160768072289155
2014	11.401199749306116