Year	% of total reserves
1970	69.71518484476019
1971	51.99225368271525
1972	61.83324999788897
1973	64.15696071170933
1974	11.11607105603084
1975	11.002220466564145
1976	10.640922512816099
1977	61.78290460857507
1978	132.23887909026877
1979	49.332152952463126
1980	39.92749216137823
1981	105.4582350463235
1982	126.22357596231902
1983	278.65407965740343
1984	270.645990969468
1985	232.03743159966675
1986	263.0521122159321
1987	193.57637552730736
1988	225.35608345710364
1989	114.14147660339732
1990	89.28777365262678
1991	85.72527799051504
1992	280.628959526323
1993	314.83297930734994
1994	262.30371504758324
1995	284.92146781672994
1996	151.93246955385666
1997	110.61052597882126
1998	137.59970968174454
1999	169.43787156860185
2000	52.97740022150911
2001	54.7347436332907
2002	73.08276784243107
2003	78.2084211900809
2004	47.49154856518095
2005	31.14331392957946
2006	22.7200536686383
2007	19.86721783106635
2008	15.65277832626638
2009	15.158591866852769
2010	25.923943938794565
2011	28.71675720380006
2012	30.059161209174878
2013	32.456272418804126
2014	31.433039770801237
2015	31.656193035197152
2016	27.724644423136276
2017	41.43908995305168
2018	33.87240670412608
2019	49.441807479264426
2020	46.40796466500092
2021	41.17795164601673
2022	57.323356871660344