Year	% of output
1960	16.48036686729722
1961	16.376122556788168
1962	15.782983970406905
1963	14.762165117550573
1964	15.145395799676898
1965	14.452473596442466
1966	14.730092712936488
1967	14.245738997710506
1968	13.930589184826472
1969	14.0767131594906
1970	14.138596867624972
1971	13.477193435844425
1972	12.507806733662635
1973	11.693918299066429
1974	12.290206076056936
1975	13.11028982688193
1976	11.642431021625653
1977	12.10205670835051
1978	13.620410367170626
1979	12.98342541436464
1980	12.608426270136308
1981	13.512822697452501
1982	13.135762915498598
1983	11.852187370248744
1984	11.644010350231422
1985	11.506276150627615
1986	10.53681410974244
1987	11.156897084578139
1988	10.65908330545333
1989	10.935008610243
1990	7.40430807376414
1991	7.181042767900047
1992	7.2718428892807205
1993	7.145149525893508
1994	7.265214771455625
1995	7.2347623537241414
1996	7.164203657500069
1997	7.370179740763697
1998	7.4444326278847175
1999	7.322103815744242
2000	7.758554793996994
2001	7.651875063175984
2002	7.415885205149031
2003	7.094685729700566
2004	6.992713004484305
2005	6.930739154719791
2006	6.90564652997569
2007	6.922953854592828
2008	7.137807575653919
2009	6.885600533910202
2010	6.905843577409584
2011	6.741901400535036
2012	6.768480028917405
2013	6.674678746417675
2014	6.544075393632916