Year	% of output
1971	8.755186721991702
1972	9.342940889106009
1973	9.727920535521486
1974	6.954666666666666
1975	9.413077853222957
1976	10.34948505824751
1977	9.76733471550334
1978	7.278709573870476
1979	17.076923076923077
1980	16.853801169590646
1981	25.487329434697855
1982	14.496902816094945
1983	16.830875065586195
1984	27.254098360655743
1985	22.843393231966417
1986	19.023779724655817
1987	19.98770527794854
1988	21.492714334124024
1989	20.445464256043046
1990	24.46478553597095
1991	24.153343023255815
1992	24.746188465966576
1993	18.72743207712533
1994	23.513449340253043
1995	25.771076079506514
1996	26.875640746838982
1997	26.341975123632547
1998	26.501858978540213
1999	27.54770907142219
2000	28.7761722205839
2001	28.882100720230923
2002	29.248322472808315
2003	28.91048882717478
2004	27.537447030297535
2005	23.116638232917303
2006	26.071104929295483
2007	15.647623201046663
2008	16.282274910093246
2009	14.378516957438025
2010	18.72691523181242
2011	15.59020433847821
2012	14.941537440915498
2013	18.200660044959584
2014	17.903147405517075