Year	% of total reserves
1970	178.28079238444488
1971	120.29089210772356
1972	67.94575715038515
1973	50.32017041186878
1974	59.39665927091596
1980	82.70357182656582
1981	93.66997155405876
1982	63.88438045412114
1983	62.2107855413143
1984	87.19157184888404
1985	140.82222704304993
1986	146.2245419572846
1987	146.72389438309256
1988	134.6150604097264
1989	73.46505803632948
1991	126.10250454309033
1992	130.86213834669155
1993	133.93372464135436
1994	101.16360873042115
1995	69.20555646708462
1996	75.27699511783577
1997	57.52924876883909
2000	77.22047068608096
2001	65.71159566909421
2002	50.5247245565386
2003	52.35420676472445
2004	41.81914910733743
2005	36.19725725827384
2006	32.169346058383944
2007	35.20696268074702
2008	34.7797020156852
2009	28.611735955413096
2010	33.2716894414109
2011	34.68536279337881
2012	35.546659908230104
2013	39.07279256050565
2014	41.63798688475315
2015	34.58599800694156
2016	32.0139909364262
2017	32.64675109957366
2018	29.72494189902301
2019	28.372297531054258
2020	27.946073081766485
2021	28.0812798264346
2022	31.663831641289995