Year	% of output
1960	9.124821806845281
1961	8.512342897200941
1962	8.284186612203685
1963	8.480381530457402
1964	7.743490545973811
1965	7.634897001451215
1966	7.6435075307048805
1967	7.2506544838560645
1968	7.116551477984361
1969	6.921734070410242
1970	6.745583087003309
1971	6.664142856226219
1972	6.251715819416942
1973	6.221645078571898
1974	6.2944548213244
1975	6.687750277936684
1976	6.5598935183161124
1977	7.07816583511523
1978	7.064051825156427
1979	6.782579043452587
1980	6.723848461765666
1981	6.494576062112252
1982	6.5371963744487696
1983	6.662062100697795
1984	6.622904482524569
1985	6.769735574537153
1986	6.5495752593788215
1987	6.640863665584605
1988	6.290873121630209
1989	6.461661223093965
1990	6.640236433932009
1991	6.69557053399821
1992	6.246589755462369
1993	6.35808488802395
1994	5.535058460617835
1995	6.138016819998331
1996	6.281326105742792
1997	5.913668346723888
1998	6.2052256606987255
1999	5.785084328242239
2000	5.682344763670065
2001	5.618702845846033
2002	5.580983689467695
2003	5.654278509146863
2004	5.580172671484588
2005	5.642583288107701
2006	5.585390353896515
2007	5.607508132864577
2008	5.886231061072218
2009	6.572532850415423
2010	6.275906678362884
2011	5.8255672882498315
2012	6.732271583642698
2013	6.625960066860855
2014	6.342389365778987