Year	% of total reserves
1974	0.1401377942205463
1975	0.39279918517537443
1976	1.2561770898669042
1977	11.67527131447593
1978	19.759822107486453
1979	61.28553129738611
1980	180.2472326833802
1981	88.63107010474297
1982	339.93392949254473
1983	419.94871321681717
1984	1467.6770240316373
1985	817.8816058556429
1986	432.7867685411311
1987	544.2761839431462
1988	608.5531236553809
1989	842.5343662728447