Year	% of total reserves
1973	51.16360488057425
1974	39.74451645386966
1975	65.14334655369193
1976	61.66602806137842
1982	75.8852802798765
1983	74.03148287759743
1984	77.25997514818346
1985	90.04961580321944
1986	72.11808700372133
1987	55.88898060316643
1988	60.65679342758432
1989	57.66787800244115
1990	55.26222267742781
1991	52.07087961134681
1992	82.2213403413895
1993	85.19085664240475
1994	65.82316576959182
1995	70.87234157582273
1996	63.394053338141674
1997	57.481813307231576
1998	34.37322946909836
1999	27.311096853797896
2000	22.2532417542932
2001	31.983848954165
2002	26.1046834456463
2003	24.33082490293948
2004	21.3571936495143
2005	19.47175905712182
2006	17.19219318212164
2007	14.418363518409102
2008	10.93920358834575
2009	11.29164247618926
2010	18.811080439642424
2011	24.178773646082917
2012	24.283817672796815
2013	28.46533579864912
2014	32.011168412970065
2015	24.912197944092124
2016	26.390842415799955
2017	31.899898774491653
2018	37.5086807131503
2019	35.96085910834152
2020	35.09395189012027
2021	39.94882420209195
2022	37.67627920787946