Year	% of total reserves
1970	196.27439964779842
1971	178.14249699153874
1972	167.7098309697635
1973	122.6798962312112
1974	54.40866535017066
1975	79.3334775254067
1976	96.33871068932245
1977	91.91056564109799
1978	115.4981752872531
1979	101.12394162766196
1980	54.666937935117446
1981	70.54419032261917
1982	42.018787165254054
1983	61.190966519437076
1984	95.47652152194308
1985	133.21111488394055
1986	147.52838051876077
1987	156.36994089655946
1988	74.61437499537548
1989	45.25075943279536
1990	30.200275529239683
1991	34.31829261805181
1992	36.69068621491169
1993	36.19770348767982
1994	37.82549940269299
1995	30.499144712858563
1996	28.743469805571497
1997	31.601391995516902
1998	33.88846881006496
1999	33.04449591445798
2000	33.986450832290835
2001	33.1581265112559
2002	41.44594192545086
2003	30.26779818333037
2004	21.424814254331295
2005	10.125433069266547
2006	19.248695245812506
2007	4.196752815803214
2008	3.497903764831661
2009	3.550028434857507
2010	3.4564887805261866
2011	2.6990314525530494
2012	2.368235746233226
2013	1.735385734233585
2014	1.909542604011082
2015	3.26446270162306
2016	4.724662821503321
2017	2.6351825596026393
2018	7.872680561886693
2019	9.872743275184572
2020	11.004596448369954
2021	16.052978777443464
2022	16.81148892404186