Year	% of output
1960	9.404164629029239
1961	9.171518427216771
1962	8.900574189682342
1963	8.74633738478853
1964	8.625181737032012
1965	8.679052316537614
1966	8.727310619853434
1967	8.433549714614468
1968	8.335888385881033
1969	7.9717483292396265
1970	8.038683637041999
1971	7.915895976438317
1972	8.029449795588764
1973	7.853565772579227
1974	7.567995361710524
1975	8.036411513665668
1976	8.028925706810183
1977	7.7634279482552015
1978	7.845863208040771
1979	7.660024652252743
1980	7.783938492659682
1981	7.10613120323628
1982	7.431683455467361
1983	7.587842211010328
1984	6.8432615325809305
1985	7.053965657963842
1986	6.671383791304475
1987	6.164090229695442
1988	6.0386310891943635
1989	8.048828787710253
1990	7.67579829338287
1991	6.697721397526017
1992	6.725213174530578
1993	7.046872495502696
1994	6.89085436251698
1995	6.995236019897507
1996	6.989253720467186
1997	6.423005239169043
1998	6.587950735649959
1999	6.388755744180165
2000	6.490968004302824
2001	5.938105960932526
2002	6.5839317950533385
2003	6.2114073902361975
2004	6.576863506194632
2005	6.593412593947534
2006	6.510793061395094
2007	6.417474466048189
2008	6.311186594398062
2009	6.587150793524761
2010	6.387218077297965
2011	6.374167701245008
2012	6.468431971143079
2013	6.397898915259286
2014	6.328610118030697