Year	% of output
1971	10.637450199203187
1972	11.785917631429113
1973	12.000700770847933
1974	11.51354045522512
1975	10.71645415907711
1976	10.965948575399583
1977	9.772874756651525
1978	9.735973597359736
1979	10.189321420974261
1980	17.168885774351786
1981	9.853427895981087
1982	9.609826589595375
1983	9.16724376731302
1984	8.884549670490603
1985	16.99319616361997
1986	17.023375834851244
1987	17.413374531008607
1988	17.96176591940586
1989	18.301725835028545
1990	14.490149094781682
1991	15.490299690495963
1992	15.834633385335414
1993	17.605889838211233
1994	18.61262014208107
1995	19.65647323220162
1996	19.462073133877304
1997	19.185635515340024
1998	18.43370087644897
1999	17.354402428926306
2000	15.773017562533262
2001	15.504281325576835
2002	15.453213580482833
2003	15.237191650853891
2004	15.421517206089291
2005	15.213140398904967
2006	16.084765316655535
2007	16.852019972764413
2008	15.883251315119635
2009	15.501296943723919
2010	15.910789216531587
2011	15.692567567567567
2012	15.74777512481007
2013	15.376175548589341
2014	15.289682949499122