Year	% of output
1971	7.121185079421738
1972	6.962663975782038
1973	7.256063169768754
1974	8.19500523403619
1975	8.450953497632849
1976	8.745373076173777
1977	9.580518406176754
1978	9.886610748679715
1979	9.472801536422407
1980	10.575843909177243
1981	12.00108148298354
1982	11.263193264023402
1983	11.260893009340592
1984	12.899895993806549
1985	14.551645527345594
1986	11.50028506858819
1987	11.897919520820722
1988	12.280637967810742
1989	11.954939560787292
1990	11.872311059833299
1991	11.954749022754925
1992	10.711295460450971
1993	12.317478349855515
1994	13.39488504436958
1995	13.228628905208561
1996	12.255867170453941
1997	13.020020080823528
1998	12.795553117965525
1999	13.920366040550194
2000	15.659235267761707
2001	15.25631098459902
2002	14.54492961340864
2003	14.040625857809498
2004	14.359313949704513
2005	16.053075231273482
2006	16.2545186986148
2007	17.458889520962046
2008	18.442747873889708
2009	18.229196219323267
2010	16.40718998948795
2011	16.033107247332335
2012	18.199190897073997
2013	18.517144817610298
2014	19.34338625711862