Year	% of output
1960	12.93728533265488
1961	10.349703915387561
1962	9.607364859548353
1963	9.284695639120319
1964	9.409146094698501
1965	10.062563067608476
1966	10.005315451608947
1967	10.299239728849106
1968	9.626386746928013
1969	9.291021456843275
1970	8.974336937277618
1971	8.934642992066491
1972	8.854598177299088
1973	8.636295170411753
1974	8.152322805369652
1975	8.38619656076795
1976	9.021199819576003
1977	9.328590607742454
1978	9.051324237063794
1979	8.616226194228085
1980	8.51462686567164
1981	9.1500736868149
1982	8.021171321698448
1983	7.859710024620552
1984	7.119457780288055
1985	8.830028521644326
1986	7.131773322574639
1987	8.173174185717176
1988	7.003439066330078
1989	6.493746793497001
1990	5.662316731216748
1991	6.121396850664327
1992	5.8158002595805725
1993	7.500125294441938
1994	7.1873080313025834
1995	7.861455146349046
1996	8.41754379262259
1997	7.525295491157891
1998	6.850409255267068
1999	7.355646961655777
2000	8.196560265523363
2001	8.201801742398642
2002	7.112254299754301
2003	8.658560593987007
2004	9.884021905964198
2005	7.286239935881089
2006	8.34337001534375
2007	7.42844128364876
2008	6.872667266301693
2009	5.785660296688782
2010	7.701358347263019
2011	6.416871092822664
2012	6.204140639917078
2013	6.024611049491891
2014	6.079617067678756