Year	% of total reserves
1970	60.00656143319447
1971	52.62788658902448
1972	33.54140364652904
1973	27.670790437920978
1974	49.45897286493648
1975	79.34995490927224
1976	60.66644154535695
1977	80.63746680477473
1978	58.06090359334781
1979	87.84507419421749
1980	196.9318914646184
1981	205.2564855413716
1982	437.3745351626817
1983	312.6652875195395
1984	92.11600417706963
1985	80.72374505392762
1986	115.21520312868365
1987	164.3981754401152
1988	115.11556106055079
1989	186.1251454132947
1990	237.20868873991026
1991	280.1639897947895
1992	101.42507939379848
1993	97.1315789066135
1994	82.90334488487979
1995	60.237623412223506
1996	59.71763872246505
1997	66.74970470311327
1998	67.16662619802634
1999	80.43083137367097
2000	93.81461008967956
2001	78.82930014951674
2002	61.83896508471163
2003	49.889650148107286
2004	47.73229068511727
2005	44.59724699018062
2006	23.67466804216075
2007	21.76305002263339
2008	18.90982580458376
2009	16.67903474306802
2010	22.695112762293387
2011	11.97133765113138
2012	8.731628843728911
2013	9.338065157584566
2014	16.00156825755938
2015	14.68347324102171
2016	15.672397933409338
2017	14.014605850472181
2018	17.83884931097379
2019	22.186156408237697
2020	19.398287250168906
2021	21.74234333235587
2022	20.873743155047016