Year	% of total reserves
1970	164.4293137352865
1971	130.86226557590302
1972	114.76976374043082
1973	103.65543132126322
1974	80.19573796099567
1975	183.86871956426805
1976	303.65141726324896
1977	402.12584862282324
1978	340.2477406222743
1979	74.47073509996993
1980	74.32373657394919
1981	86.37337492339667
1982	114.46427688324654
1983	85.07513212054987
1984	86.71530856205707
1985	78.96333415156565
1986	124.1622726246908
1987	263.91003915584827
1988	388.10826455394493
1989	301.26397694793343
1990	282.3002685742999
1991	139.84785937711942
1992	112.17639363199137
1993	145.98881192068896
1994	90.47915741638636
1995	111.62373970451573
1996	58.57614878677584
1997	57.75985111396743
1998	63.2926617522504
1999	50.51728138485806
2000	45.277566052535036
2001	33.56118484981808
2002	26.63293169587565
2003	24.652941876003215
2004	21.888467799710273
2005	22.663615944821995
2006	17.268924686849125
2007	19.196763318516908
2008	17.35008576687655
2009	14.400003175047374
2010	14.458623340469629
2011	12.931089508281971
2012	13.936406002217103
2013	9.80739346235574
2014	11.15945646573286
2015	11.48587500592785
2016	12.563769869915763
2017	13.624097078051278
2018	16.57183163018639
2019	12.517096852757476
2020	13.718795767902753
2021	13.086396943937203
2022	14.554362194074733