Year	% of total reserves
1970	290.50994726327565
1971	329.44676044222996
1972	225.89271800193234
1973	151.512314301968
1974	176.28729129373346
1975	159.97789545239752
1976	82.24713622368
1977	96.61638965025088
1978	68.5856070681057
1979	39.999458935987725
1980	36.099555416948135
1981	45.63627254982924
1982	55.73206228450811
1983	92.82459142851101
1984	160.625994299367
1985	141.26566715032467
1986	45.87610529621028
1987	48.471359674177826
1988	43.52665119570047
1989	41.86348276977665
1990	29.544273325197633
1991	25.607832924078917
1992	32.25965399275976
1993	45.38170819855393
1994	55.43261831537607
1995	65.60496845902985
1996	59.20441672399915
1997	58.13339361409396
1998	71.19542919844913
1999	48.93337315866505
2000	31.878695178763532
2001	32.086819503193034
2002	33.74070662951841
2003	32.56343621487821
2004	37.819492877485246
2005	37.69335181837842
2006	30.851014909867597
2007	24.631544487103614
2008	23.797092597957867
2009	16.058879959149902
2010	28.181436108720437
2011	33.22123299248565
2012	27.931372063008062
2013	25.234186579355868
2014	26.108644166158918
2015	25.82025291888515
2016	24.429840347293414
2017	27.64355953463339
2018	31.151074018647197
2019	29.695390345053585
2020	23.760247929532458
2021	27.33335912187642
2022	33.71727133491946