Year	% of output
1971	5.133991537376587
1972	4.952166572875633
1973	4.98960498960499
1974	5.467625899280575
1975	6.052631578947368
1976	5.919765166340508
1977	6.038647342995169
1978	7.8921568627450975
1979	9.000725864989112
1980	8.323959505061868
1981	12.698412698412698
1982	13.23666978484565
1983	12.906019922044177
1984	12.223371251292656
1985	11.545155675884741
1986	11.080281169071402
1987	11.240957150806901
1988	10.200296735905043
1989	10.552111863918121
1990	19.75221238938053
1991	13.728460518841128
1992	9.48460398485098
1993	3.6248872858431023
1994	3.8591867469879517
1995	3.3511413307430793
1996	3.028318873792765
1997	3.727939718421575
1998	4.018612521150592
1999	3.769317753486619
2000	2.6746907388833168
2001	2.432069775243207
2002	5.098360655737705
2003	2.9282576866764276
2004	14.02689313517339
2005	10.970979115812314
2006	6.310486543815458
2007	5.125602638924131
2008	11.180288779970857
2009	5.131143366437485
2010	4.971537001897533
2011	7.102164830991264
2012	5.648975302154493
2013	5.655122305643013
2014	21.436651583710407