Year	% of output
1971	10.15916017609211
1972	9.831660475776497
1973	9.752072315367014
1974	9.8175313059034
1975	11.05544763657431
1976	10.699629335451416
1977	11.263999012741802
1978	11.721600765687622
1979	11.274939560585532
1980	12.680703168286907
1981	12.662529931254667
1982	12.85664142807
1983	14.303653233495336
1984	13.963883823333184
1985	13.948967193195625
1986	16.684692773911802
1987	15.75549107400219
1988	14.024040117903763
1989	17.083407574587714
1990	18.312968072526605
1991	18.934039497976617
1992	20.395125355666504
1993	20.26601273223334
1994	17.920535755809446
1995	17.70200701335522
1996	17.52432339350802
1997	16.263243796508895
1998	15.16375722855753
1999	14.828438987410989
2000	14.832977167922618
2001	14.256228152915718
2002	17.170497199625828
2003	15.265674236661958
2004	15.41955772974592
2005	15.125460939795813
2006	15.1175738520993
2007	16.717404459339942
2008	13.38278346107036
2009	14.747496288519427
2010	13.425353057167719
2011	14.434796032573038
2012	13.599799449962028
2013	16.018349415435942
2014	14.657381534942306