Year	% of output
1960	9.0111858436867
1961	8.924266507253218
1962	8.606929706942832
1963	8.472529540241657
1964	7.995833842821458
1965	7.759081223915851
1966	7.408991194428252
1967	7.4535549302529205
1968	7.218855151284058
1969	7.166890726942679
1970	7.112101749889778
1971	6.831969572393026
1972	6.790385208833317
1973	6.712403483777263
1974	6.382631633064675
1975	6.688741787885405
1976	6.433863779874528
1977	6.491048783598056
1978	6.160588244159507
1979	6.122011834413762
1980	6.330201333941247
1981	6.286724443250706
1982	6.262085811076055
1983	6.6410916142034235
1984	6.436817121752725
1985	6.5013058391124385
1986	6.236182443904128
1987	6.086161401404326
1988	6.135504923288298
1989	5.9657465233076925
1990	6.188779594515202
1991	5.747503654213406
1992	5.587224211659452
1993	6.020435909132789
1994	6.065226454090467
1995	6.391074502419935
1996	6.256894775203035
1997	5.822438337205279
1998	6.204245725073682
1999	6.035135933426653
2000	6.395943835370581
2001	6.249431460624887
2002	5.876054967974577
2003	6.025852986609908
2004	5.992749162880784
2005	6.160622535095481
2006	5.859657102051139
2007	5.907077036755851
2008	5.9967627927583225
2009	5.937615577237741
2010	5.855669807033815
2011	5.741028385005403
2012	5.968220885892832
2013	6.128272811585932
2014	6.05720470089019