Year	% of total reserves
1970	31.40535868625756
1971	42.11847501888898
1972	41.59112850370461
1973	52.35221967939931
1974	85.88447929369426
1975	107.83947799630134
1976	78.40030170457344
1977	57.628130786452935
1978	109.26434130599122
1979	64.16916019380093
1980	118.8728499306726
1981	178.91990847990294
1982	136.8682116540694
1983	100.48814646654523
1984	90.74343194842702
1985	112.7843332435319
1986	83.69423370883923
1987	200.97932720072754
1988	180.1399254072928
1989	192.65022323100203
1990	395.69014943015765
1991	487.51778337326425
1992	976.4122872686825
1993	206.6760600439329
1994	115.12662051739535
1995	164.86161167328294
1996	68.01055693635755
1997	98.18689083221098
1998	106.53930051450224
1999	98.43860067265774
2000	84.28023167453685
2001	49.72643608210021
2002	61.63687158939819
2003	46.67748524241248
2004	43.57779082131056
2005	27.246293964003094
2006	24.41534957292319
2007	28.825656269701263
2008	33.01353927323642
2009	24.952776089109285
2010	24.10073591944614
2011	30.304377907319534
2012	27.60416669364115
2013	36.667695960712315
2014	25.365750757173945
2015	35.905652037293805
2016	28.253360417675687
2017	36.266377574653724
2018	31.188599400667233
2019	28.730424965193542
2020	27.63884920756371
2021	25.65619574543372
2022	32.21454850564993