Year	% of total reserves
1980	78.94079186484447
1982	131.50603093358148
1983	111.20423666842635
1984	99.46779375767916
1985	97.47037126835588
1986	85.57403280344857
1987	78.7675608784525
1988	93.11720788997697
1989	97.0193126683801
1990	95.80658075399374
1991	84.27218484992794
1992	89.7072678168323
1993	85.95250193054714
1994	77.4609864776346
1995	75.99752960993021
1996	67.32094602861295
1997	62.54438921797144
1998	55.71157465205919
1999	49.882195881999806
2000	43.92469701178324
2001	42.08203443679298
2002	34.81671159512502
2003	32.23340032890091
2004	27.842319198300476
2005	25.62633539510606
2006	23.0483653906357
2007	21.261611222423294
2008	18.673799034487097
2009	16.675890661162143
2010	22.43268594267681
2011	25.81524993767195
2012	26.67040398697455
2013	30.282800303822263
2014	32.713660394080776
2015	27.720364914174805
2016	28.122886002785744
2017	31.576975263797596
2018	34.649511535696085
2019	33.590051439687656
2020	31.588311776704092
2021	34.247972829520755
2022	34.629081188872924