Year	% of output
1971	8.257306499445363
1972	8.255008434989053
1973	8.275702234170762
1974	8.224956223551729
1975	8.2021253697075
1976	8.227287080047326
1977	8.186096375812761
1978	8.31182752392489
1979	8.346293416277865
1980	8.146483328114801
1981	8.784798621791003
1982	8.691440690658048
1983	8.70335722419753
1984	8.79555695274023
1985	8.378288582934992
1986	8.747648126171528
1987	8.809151536424263
1988	8.309990527064802
1989	8.11371031381409
1990	7.997355827374025
1991	8.269530617734496
1992	8.33800006538698
1993	8.397397763482175
1994	7.496420113454865
1995	8.405528401798312
1996	8.211798223636272
1997	7.902144577613976
1998	7.776122823098075
1999	7.918910841350892
2000	7.75014614441285
2001	7.882188013621373
2002	7.994161051982182
2003	7.5519870955077515
2004	7.197748150282382
2005	7.426603076146222
2006	7.065072600879286
2007	6.786437896662343
2008	6.621494741724992
2009	6.436008421396131
2010	6.465244846168823
2011	6.1926993344955905
2012	6.145756786344583
2013	6.072770194266895
2014	5.841038125178393