Year	% of total reserves
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	77.9224414746302
1978	97.43815576581389
1979	151.1558684958376
1980	152.91257199121614
1981	92.32389528598353
1982	299.74053094153265
1983	359.62977463398624
1984	69.35533587943897
1985	164.0949664194187
1986	270.3968505336308
1987	162.9446277668555
1988	33.018567349162346
1989	45.33702687175824
1990	41.07507256339331
1991	18.871188279328706
1992	110.75755164830166
1993	17.242636495259745
1994	25.772620280076218
1995	37.83695641953592
1996	44.39817610241181
1997	16.09966682391554
1998	12.327390766522358
1999	26.949288655297426
2000	30.32354807792128
2001	17.48975759116724
2002	72.88047271207645
2003	45.26862548906015
2004	28.65714936087108
2005	26.121571646289183
2006	49.319297609809276
2007	26.83509373125491
2008	33.08276434492585
2009	41.03466275691287
2010	13.216595404010988
2011	17.509387001619274
2012	8.784563136178827
2013	4.900522929428152
2014	3.5822261395177746
2015	1.8592707983869823
2016	7.208011247277332
2017	6.987416136886718
2018	3.3154265250496815
2019	8.064375402550615
2020	30.012820438378608