Year	% of total reserves
1977	87.27635434199863
1978	78.69509228788095
1979	363.18455509892004
1980	126.22776221845291
1981	40.32736949054139
1982	75.26122518340715
1983	234.18384528236777
1984	295.6881110180044
1985	89.53359973133918
1986	44.26106875734826
1987	40.548791934985225
1988	10.61041240255425
1989	8.48917246258661
1990	8.734406445995017
1991	20.298602122429035
1992	20.766986869427324
1993	48.86998230501166
1994	46.97727350443607
1995	94.97638980416689
1996	53.23527116329076
1997	306.34092122838547
1998	114.59685672971078
1999	71.52322965870191
2000	40.68381744325064
2001	45.37961428537761
2002	40.08497752986177
2003	95.62978581960297
2004	2.7103910375396287
2005	9.60704188185359
2006	6.7929214848607655
2007	6.703824768811592
2008	4.5041756768648415
2009	4.450851232666388
2010	3.1707416472093914
2011	3.2974905086445143
2012	2.1244335422728673
2013	1.420699510294989
2014	1.116109534104414
2015	1.6223189987298066
2016	1.0876955397419068
2017	1.5389071632687334
2018	1.2339742965296114
2019	1.5163263870634713
2020	2.2953251616239467
2021	2.3375420990009896
2022	2.0392180053610742