Year	% of output
1960	16.696914700544465
1961	14.759535655058043
1962	14.975845410628018
1963	15.701219512195122
1964	14.684287812041116
1965	15.634218289085547
1966	15.929203539823009
1967	17.847025495750707
1968	17.28395061728395
1969	15.443592552026287
1970	11.088709677419354
1971	10.980876002467612
1972	10.813823857302118
1973	9.439655172413792
1974	9.382924767540151
1975	10.030133448127422
1976	10.08574928542262
1977	10.410334346504559
1978	9.272257111193202
1979	9.543147208121827
1980	9.139447236180905
1981	9.52959028831563
1982	9.633911368015415
1983	9.3521421107628
1984	8.222278099069651
1985	8.564102564102564
1986	9.261059795819154
1987	10.831353919239906
1988	8.798570790531487
1989	8.463742561163764
1990	8.758314855875831
1991	8.611481975967958
1992	7.545094588649362
1993	6.621535857837952
1994	5.02092050209205
1995	6.585023087733386
1996	8.88151473745852
1997	7.984246330110992
1998	6.973411877089636
1999	5.370061213133
2000	4.112441436751692
2001	4.39437321050666
2002	4.693441064638783
2003	5.764705882352941
2004	4.430012756581236
2005	4.386368869445084
2006	4.159113796576032
2007	4.132921432746096
2008	3.497904900710512
2009	3.0177022692170605
2010	4.097543818512222
2011	2.92254953227587
2012	2.769388569149239
2013	2.06447339368514
2014	2.7478894222810792