Year	% of total reserves
1980	15.723507847079276
1981	24.47674246027016
1982	10.238292107385172
1983	19.720724699334518
1984	88.12741833729189
1985	38.25867769220614
1986	43.362917452474726
1987	48.99229144187614
1988	46.26930471503471
1989	41.22422345446236
1990	41.43285330617928
1991	42.63086604259828
1992	43.215406417069495
1993	35.870704416070275
1994	22.16113962937868
1995	22.2591351046754
1996	18.387062695757848
1997	33.98861414623391
1998	32.53242692223557
1999	53.17354046671278
2000	64.86939906546579
2001	38.250091545524114
2002	36.67811694775595
2003	29.05429825674676
2004	32.683829458920066
2005	39.18817941135507
2006	38.69538196580531
2007	9.880170466913505
2008	4.9691991469103645
2009	3.1441680383355015
2010	3.027976653593794
2011	2.994863527904541
2012	2.115413224057471
2013	0.9223315680880197
2014	0.934556000221148
2015	0.7344676254825725
2016	0.9511073317533869
2017	0.5301315441301971
2018	0.6201876200029565
2019	0.938576140334812
2020	0.6223270488082894
2021	0.5351551625103524
2022	0.551401168651747