Year	% of output
1971	10.722296994167788
1972	10.385878489326766
1973	11.083392729864576
1974	10.528031290743154
1975	10.743801652892563
1976	11.121605667060212
1977	11.238136324417601
1978	7.864963503649635
1979	8.66386685332089
1980	10.908325143900042
1981	11.717022844509948
1982	11.334610472541506
1983	13.603444901154823
1984	14.746914684314078
1985	15.039921785888872
1986	14.282412757106542
1987	14.50243672378557
1988	15.287125877130173
1989	14.356564865570348
1990	14.362891207153503
1991	15.128279042951858
1992	12.184184622115279
1993	15.602142783558257
1994	16.164562691746717
1995	16.941415166117167
1996	18.470998353829767
1997	20.342373354421547
1998	19.69306164560227
1999	19.105707476673263
2000	16.153785613096176
2001	16.28920187793427
2002	15.719039351851851
2003	14.23353961651618
2004	15.923200000000001
2005	13.194751584844463
2006	17.87032305683302
2007	17.87020109689214
2008	18.11064718162839
2009	20.412456819303397
2010	19.877990116762145
2011	19.32492581602374
2012	19.28323779988501
2013	18.405409918183334
2014	17.127424426387723