Year	% of output
1971	7.913018652455273
1972	8.436980827084549
1973	9.478047003097103
1974	9.668508287292818
1975	9.458334984348378
1976	9.968645258946914
1977	9.373948165600808
1978	9.99618950844659
1979	8.737024221453288
1980	9.915315056695851
1981	9.994049551011576
1982	9.609728366988804
1983	9.48696304633277
1984	9.627954871060172
1985	9.646425826287471
1986	9.971305595408895
1987	10.151128286522669
1988	10.648364096754847
1989	10.510286951813752
1990	10.54317647896348
1991	13.065929225197003
1992	18.008986239820278
1993	15.38805695186462
1994	15.107649542391105
1995	14.90822943836895
1996	13.777039048600056
1997	14.671171488233501
1998	13.487452691463972
1999	17.420237249796156
2000	15.475077498400827
2001	14.092433500252676
2002	14.65768692641514
2003	14.236439236439235
2004	12.291797421908946
2005	11.104793959792596
2006	10.784141356423893
2007	10.927638167547803
2008	10.47236676834739
2009	10.646280172718907
2010	9.735532520590215
2011	8.787957539531815
2012	9.083492561025356
2013	9.043627667231652
2014	8.551580113793765