Year	% of total reserves
1970	9.657601747110938
1971	3.4980434165502596
1972	6.37826782946341
1973	74.69745208385014
1974	9.475746575075002
1975	54.984648322545105
1976	11.747342651675558
1977	33.09451855332674
1978	127.20203196570866
1979	106.38247998511383
1980	97.2891895199643
1981	97.95619342921479
1982	46.84036172010628
1983	18.8109718597619
1984	7.164962709524955
1985	54.542013099343
1986	153.09289872507463
1987	66.23725907245209
1988	55.854139728178524
1989	24.30549855097979
1990	22.530034019973783
1991	30.958803349189623
1992	26.163404277889008
1993	59.88921345283593
1994	32.80334246002944
1995	11.649595893115317
1996	10.358546394248041
1997	18.207411220556928
1998	17.788628452111542
1999	25.740792754995233
2000	20.20869134321092
2001	14.550757738298298
2002	8.421611058986976
2003	7.946501759889254
2004	6.714861742915831
2005	4.751069007988935
2006	2.0767259381504033
2007	2.6788829265459624
2008	0.3045211412947483
2009	1.9334421573467577
2010	1.4751085622885318
2011	1.911710448981743
2012	0.6025197634591297
2013	0.5871590312108722
2014	0.43127623656827346
2015	0.0013553190522112518
2016	205.35165190051904
2017	323.7994793098326
2018	21.17829418824998
2019	8.551599509334265
2020	7.944009097738223
2021	15.107407274239055