Year	% of total reserves
1980	73.66321265626756
1981	126.39977556453177
1982	132.90196716954344
1983	110.17607014411537
1984	102.88170233038326
1985	101.81608150539779
1986	93.45975819961635
1987	82.38466170494544
1988	93.24994286110639
1989	102.15522029543229
1990	101.8112165559938
1991	88.41524587306753
1992	92.56964231290668
1993	87.92545444430701
1994	77.91012860912029
1995	78.28180799034155
1996	68.99226609889106
1997	64.52572642928608
1998	54.25348306530304
1999	48.28125980675851
2000	43.2709477295825
2001	41.34069523212401
2002	34.677640784471535
2003	31.710083492141436
2004	28.37718644270778
2005	26.45291891459034
2006	23.543789112040162
2007	19.857868031814007
2008	16.772599188880637
2009	15.681213095758798
2010	22.18186353129235
2011	25.764335701453255
2012	26.646211515383037
2013	30.33671665932534
2014	32.69869111763523
2015	27.175694441903733
2016	27.54977445171081
2017	31.586726731922646
2018	35.8792318380093
2019	34.96995954564288
2020	33.10004059218596
2021	36.53487694526354
2022	36.960931076559376