Year	% of output
1971	12.037871956717764
1972	11.126512768566402
1973	10.430940323701718
1974	9.840290687848572
1975	10.026587173702868
1976	10.49573403942336
1977	10.666356630348126
1978	11.555893737387104
1979	12.299513698009484
1980	12.621636275433039
1981	12.611348053770987
1982	12.495247750601951
1983	14.001082557929736
1984	13.677858183956836
1985	14.244876316942158
1986	13.172594370499672
1987	14.133620689655173
1988	16.91357777198645
1989	16.502467747775217
1990	14.23533076700563
1991	15.221559091450668
1992	14.813951423116203
1993	16.04434774051761
1994	17.272526524989747
1995	17.803670550582588
1996	18.713683870170133
1997	19.169607990387505
1998	18.8502374840112
1999	17.90004220368146
2000	19.897050970153682
2001	20.333834882510935
2002	19.374710387875815
2003	18.77206436514128
2004	18.55377906976744
2005	18.43631963449664
2006	17.689850581543425
2007	18.09428121158956
2008	19.773292811759934
2009	19.49685534591195
2010	16.497024951159243
2011	17.357526260369315
2012	17.090318638733816
2013	17.221969477645892
2014	17.626976353714845