Year	% of output
1960	5.01583949313622
1961	5.277933745087029
1962	5.169563978341408
1963	4.348288326600042
1964	4.160381489951827
1965	4.353100359259086
1966	4.764217590957259
1967	5.613946224304589
1968	5.506424792139078
1969	5.174009943425339
1970	5.3336827965796285
1971	4.958329572464422
1972	4.9784133837021045
1973	4.712544626369568
1974	4.806919695609018
1975	5.176637757851928
1976	4.846890053689281
1977	5.14839232755126
1978	5.083170157637611
1979	5.201811000866968
1980	5.192970559981918
1981	5.262632115242453
1982	5.354355916603305
1983	5.1630068056064315
1984	5.356677221084001
1985	5.38402744449777
1986	5.319241248850245
1987	5.2015980233285735
1988	5.034009389380394
1989	4.971813927060125
1990	5.127183747794913
1991	4.923720956367825
1992	4.953087802828735
1993	5.242050579437118
1994	5.004135069595324
1995	4.996191305294086
1996	5.102611195400463
1997	4.7404990945402705
1998	4.677429180627475
1999	4.949259890123072
2000	4.577579645536588
2001	4.942888397059198
2002	4.660299731896861
2003	4.496116609423057
2004	4.796509904804808
2005	4.8489656862173165
2006	4.954474320671504
2007	4.643085641166255
2008	5.099123027409879
2009	4.526423624256731
2010	4.5644922362068785
2011	4.666681645583841
2012	5.0611974859411175
2013	4.875614624409717
2014	5.425023076277586