Year	% of output
1971	8.152281378219389
1972	8.154444202765182
1973	8.181863828077928
1974	8.123612872542802
1975	8.107957037330053
1976	8.136422695581961
1977	8.097986797694078
1978	8.239716457301785
1979	8.281310640909544
1980	8.07002153730227
1981	8.745726943170043
1982	8.645326360623255
1983	8.659440796250822
1984	8.761986641095165
1985	8.324606590355586
1986	8.689168163218598
1987	8.759073050542717
1988	8.262439691743475
1989	8.063095760604117
1990	7.948307065584721
1991	8.235521648305578
1992	8.209086941974075
1993	8.294761855059683
1994	7.374348960619799
1995	8.30448800918776
1996	8.115933653551929
1997	7.810134329800599
1998	7.686806294144918
1999	7.830166217285826
2000	7.6579463230929194
2001	7.795262763496563
2002	7.918378037427642
2003	7.477355049061908
2004	7.126199467462357
2005	7.361834217595691
2006	7.006637242640343
2007	6.735390526435915
2008	6.568314845586144
2009	6.389887080692482
2010	6.423304372615381
2011	6.158210275675015
2012	6.113091346847959
2013	6.04387808081166
2014	5.81336245851583