Year	% of output
1971	4.979591836734694
1972	4.620689655172414
1973	4.230317273795535
1974	3.8421052631578947
1975	4.224719101123595
1976	4.627450980392156
1977	4.904347826086957
1978	4.774193548387097
1979	4.291970802919709
1980	4.333781965006729
1981	4.293333333333333
1982	4.276228419654714
1983	4.232804232804233
1984	4.304546677428033
1985	5.115983476326661
1986	3.172737955346651
1987	3.6860068259385668
1988	4.342369477911647
1989	5.311666262430269
1990	51.18325242718447
1991	33.47302252488213
1992	41.57336476134355
1993	46.89713799943327
1994	46.764780512560264
1995	51.03957075788061
1996	48.26145101972584
1997	55.71920428462127
1998	62.4192601291838
1999	25.584822250874932
2000	27.249895353704478
2001	36.0857908847185
2002	27.501337613697164
2003	28.886217948717945
2004	11.452015697466999
2005	11.537754914569172
2006	45.057929036929764
2007	72.9020979020979
2008	38.53041875164603
2009	23.587081891580162
2010	12.658562367864693
2011	24.93438320209974
2012	23.682539682539684
2013	27.992527662020407
2014	23.687552921253175