Year	% of output
1971	13.894956934215454
1972	14.214723217381255
1973	14.154185779058547
1974	13.855054432348368
1975	13.934660443851795
1976	14.288845951884499
1977	14.063641607383195
1978	14.650503875456616
1979	14.986084525746701
1980	15.149572979567884
1981	16.555986958889385
1982	15.788577305271156
1983	16.103365851291013
1984	17.29730027791257
1985	17.140892810652456
1986	16.591362311564797
1987	17.633091143667137
1988	17.12564778971029
1989	17.148433785948654
1990	13.302218453174872
1991	13.859762760639429
1992	14.12463612092404
1993	14.574600400586911
1994	15.134342364414374
1995	15.7576515682867
1996	16.951038639710898
1997	17.41149822914093
1998	18.580760461936503
1999	20.128640311030054
2000	20.86563298279745
2001	21.534345772541812
2002	21.101249726394347
2003	20.61413175946772
2004	19.612839771101573
2005	19.05952103519838
2006	18.404218134300336
2007	17.57943137602486
2008	16.87510296570122
2009	16.56020238827019
2010	15.70883910155879
2011	15.357139420995411
2012	15.281796024460752
2013	15.188720031680406
2014	15.44550800541093