Year	% of output
1960	8.471818710052295
1961	8.510028653295128
1962	8.324724517906336
1963	8.0169133192389
1964	8.62406899255194
1965	8.175287356321839
1966	7.130259511211892
1967	8.031026252983294
1968	7.4576651340136815
1969	6.6670003503678865
1970	6.657268882724751
1971	7.933213412665467
1972	8.28577558463849
1973	8.451459658263735
1974	7.129673193152618
1975	8.184631844407933
1976	7.988378055033328
1977	6.381050214514472
1978	6.075786409940669
1979	5.364013964273883
1980	5.664220678822981
1981	5.827568505707791
1982	5.585913782635094
1983	6.3274640377278
1984	5.783116567668426
1985	6.076514602944727
1986	5.569764137539074
1987	5.576570165911389
1988	5.571847507331378
1989	5.462957801438207
1990	5.0775143902753
1991	4.744248611733867
1992	5.236899090515375
1993	4.477807429722163
1994	4.5009218204811745
1995	4.713047552119934
1996	3.913626338777334
1997	3.6616745692147568
1998	4.221357618253594
1999	3.8973753545359
2000	3.761289585000572
2001	3.9497355207690035
2002	3.9250216796744715
2003	4.087707231458862
2004	3.49350573708428
2005	4.308463914312431
2006	3.710273107201866
2007	3.7454612591544096
2008	4.305713400144643
2009	3.84770150827679
2010	3.427374370924957
2011	3.6706983578454713
2012	4.138557895783329
2013	3.6613946699973337
2014	4.070843246100978