Year	% of output
1971	7.8542485907806405
1972	7.114661403461979
1973	7.2975367276127665
1974	7.441388613281903
1975	7.5016362106400445
1976	7.398256811474847
1977	7.347928621213133
1978	8.222566829124208
1979	8.016470772197753
1980	8.091670267493905
1981	7.63263389793781
1982	7.802150597234155
1983	8.241301265270506
1984	6.734153287485543
1985	6.751626256652868
1986	5.066041511807421
1987	5.949911910974332
1988	5.6240476520293665
1989	5.992729522778251
1990	6.8014936850093735
1991	7.386060570141646
1992	8.261470246437602
1993	7.723381744734058
1994	8.238042829428444
1995	6.8501062644111235
1996	8.029657405829214
1997	8.303373694958152
1998	8.843838128333273
1999	8.834761702266855
2000	8.887529459744558
2001	8.90628964181101
2002	7.822465849669017
2003	9.069003439314658
2004	10.813462270006207
2005	9.630202580683223
2006	9.772202880527244
2007	9.737485386332235
2008	10.294113120430936
2009	11.256563286775465
2010	10.960642115765491
2011	10.528081398571208
2012	10.276608080961891
2013	10.393182381097754
2014	10.594765610655216