Year	% of output
1960	6.587551465245822
1961	6.400363141171131
1962	6.180212931706051
1963	6.276210446054137
1964	6.189336235038085
1965	6.037584966013595
1966	5.565323477699236
1967	4.854272025552302
1968	5.006097742348077
1969	5.0479216024122335
1970	5.078564785354153
1971	5.13539996436843
1972	5.2027204294565195
1973	5.196952134835731
1974	4.908602837786016
1975	4.485974418518928
1976	4.442953712781877
1977	4.344096352468861
1978	4.339567504383401
1979	4.3326507818317195
1980	4.238805048915224
1981	4.330788565719014
1982	4.1815890701684575
1983	4.2112321877619445
1984	4.173436554206888
1985	4.151111252323384
1986	4.151404151404151
1987	4.063198819041494
1988	3.9893120340176123
1989	4.032854209445586
1990	4.344986660738106
1991	4.422994192299419
1992	4.072122914428466
1993	4.078590961521015
1994	4.205742046151728
1995	5.11168331957569
1996	5.020896011612797
1997	5.151231464466096
1998	5.086977994841684
1999	5.493542435424354
2000	5.485825216721893
2001	5.394873108911737
2002	5.319802877652869
2003	5.339916131297899
2004	5.29966210208074
2005	5.409273325927483
2006	5.511317070209342
2007	5.252698141016498
2008	5.056158881285332
2009	4.613381885989217
2010	4.72289762723233
2011	4.561129489395681
2012	5.02526670409882
2013	5.045411653691908
2014	4.770929625403701