Year	% of output
1971	13.04626003334755
1972	12.76681363286444
1973	12.348978772054506
1974	11.708670971701139
1975	11.577880534617089
1976	12.000044428154123
1977	11.929275729616283
1978	12.031509194617179
1979	12.379509994162841
1980	11.812311665949203
1981	11.039687172526321
1982	11.929856860127952
1983	11.28410895171514
1984	10.759797090138804
1985	11.374830908396238
1986	12.542052560753584
1987	13.465236486320334
1988	13.487976105737692
1989	14.203039864935018
1990	14.227115038528684
1991	15.391441993028327
1992	14.591779325865007
1993	15.22208464298187
1994	16.157067539349566
1995	16.74449657294422
1996	17.205899518672883
1997	17.455890279302036
1998	16.821238982060493
1999	17.604177870194434
2000	17.657562122037202
2001	17.23793636684647
2002	16.74395595812203
2003	16.268090981201574
2004	16.748353993903777
2005	16.594174670560474
2006	16.824177213076833
2007	16.140960177199894
2008	16.645755365854185
2009	17.18695360217626
2010	16.625851922946417
2011	16.45939780764522
2012	17.07616752077362
2013	16.633805875019263
2014	15.774797638537816