Year	% of output
1971	4.649418822647169
1972	4.790801660811241
1973	6.622114216281895
1974	5.6186317321688515
1975	7.7865897620764235
1976	6.39786737754082
1977	5.108116577875274
1978	5.970149253731344
1979	6.433408577878104
1980	6.628940986257073
1981	6.675062972292191
1982	5.400771538791256
1983	5.8473533032416904
1984	5.934207697269405
1985	6.0098733633827
1986	5.784959106323559
1987	6.146926536731635
1988	13.017306245297217
1989	14.94934047027337
1990	10.886495443247721
1991	14.478863597467054
1992	11.197492163009404
1993	4.1403785488958995
1994	11.035730438715513
1995	10.329518547750592
1996	10.426316286983647
1997	9.579293782798185
1998	9.099493518756976
1999	9.084008097165992
2000	8.06073883810531
2001	8.149242704100482
2002	8.380008616975442
2003	7.054721030042919
2004	8.144014879766175
2005	8.626078259782473
2006	8.347224794715071
2007	6.935049582977606
2008	10.12491781722551
2009	10.221014233602746
2010	9.04398100351022
2011	9.145735303863741
2012	9.611560387113881
2013	9.743655146027292
2014	9.389468485708994