Year	% of output
1960	9.364472049689441
1961	9.298028137859845
1962	8.953472802280132
1963	8.824240119473462
1964	8.47337514046471
1965	8.234334149306424
1966	7.858260030220478
1967	7.853705003509476
1968	7.697158996691703
1969	7.509925939127507
1970	7.450349358751611
1971	7.161406348676331
1972	7.147704044355387
1973	7.107342879047498
1974	6.957767127149704
1975	7.208993084932624
1976	7.088789944163011
1977	6.950990970526435
1978	6.7298737194187686
1979	6.662124382025783
1980	6.881212953229128
1981	6.839006262281404
1982	6.784838398878865
1983	7.107908922140956
1984	7.020544855294373
1985	7.0402735832839145
1986	6.722860660173697
1987	6.667237911236253
1988	6.647827100332392
1989	6.491527908873473
1990	6.653610476353215
1991	6.451764460221341
1992	6.431618232218183
1993	6.941735466680667
1994	6.857278586409198
1995	7.267526999051079
1996	7.146660908741331
1997	6.700809089344121
1998	6.935921739195562
1999	6.789602076462208
2000	7.065627366860139
2001	6.919220421966112
2002	6.618810882207261
2003	6.601226224487651
2004	6.522054145079791
2005	6.639912906944856
2006	6.339106681151289
2007	6.394332079085255
2008	6.423350144778627
2009	6.416351783047345
2010	6.275939469666168
2011	6.113721134718761
2012	6.294166327013957
2013	6.372313992529935
2014	6.217181383441128