Year	% of output
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	8.88888888888889
1984	9.285714285714286
1985	9.438775510204081
1986	9.411764705882353
1987	9.216101694915254
1988	9.223300970873787
1989	9.090909090909092
1990	9.090909090909092
1991	7.751937984496124
1992	8.053691275167784
1993	8
1994	9.149902660609992
1995	9.313725490196079
1996	13.148371531966225
1997	13.107947805456702
1998	12.20220801859384
1999	12.243797195253507
2000	12.258737610850288
2001	13.175501801338138
2002	13.157894736842104
2003	13.148479427549194
2004	13.131768953068592
2005	11.428571428571429
2006	12.206988058381247
2007	13.67595818815331
2008	14.359861591695502
2009	15.636531365313653
2010	6.5279091769157995
2011	7.021569527306104
2012	8.413251961639059
2013	6.974677920924035
2014	4.67706013363029