Year	% of total reserves
1970	0
1971	0
1972	0
1973	0
1974	0.37034944659342117
1975	6.127596789185696
1976	14.45048390833449
1977	13.453141911836214
1978	2.7431599708860572
1979	12.545630406852249
1980	22.808613071895422
1981	53.39189620382366
1982	148.2076479211877
1983	106.6317358191875
1984	215.2829389805441
1985	259.78547386524195
1986	135.31834317101732
1987	520.9174134794217
1988	755.2630491699238
1989	2558.5258313794684
1990	2733.5290153988994
1991	2127.58485872221
1992	713.189179922302
1993	526.8111039154884
1994	39.712334235502404
1995	77.58784743888592
1996	91.2244847015901
1997	24.597764743045992
1998	68.4494710535222
1999	87.2966844880659
2000	94.08466318181696
2001	37.53448832596572
2002	12.255912738349442
2003	25.208518640561838
2004	17.186720968967332
2005	12.423313299401032
2006	6.50284474009523
2007	2.3378177705179053
2008	4.089074773805093
2009	5.679510058241162
2010	1.0066709831195795
2011	7.970287626131454
2012	46.23556053182044
2013	40.12859050373333
2014	35.56234220873387
2015	36.94748414082646
2016	40.41388391424749
2017	35.52040113879873
2018	37.60892925627509
2019	35.17952715972915
2020	25.99081345845498
2021	19.170895231606274
2022	25.881651308810937