Year	% of total reserves
1970	34.74266680282178
1971	48.05143143474898
1972	56.24130173483418
1973	49.92341623000878
1974	59.66627780988163
1975	96.84552604095587
1976	108.68624745514725
1977	161.09981205974142
1978	214.6571809110796
1979	170.41921965534385
1980	192.86784081910153
1981	224.70146836893824
1982	266.4314207381824
1983	275.64115720534295
1984	359.7264396088934
1985	416.16374029722203
1986	269.81450591165014
1987	370.03080559304914
1988	377.9434814437573
1989	413.4906951663942
1990	455.1691096363838
1991	399.96279801341893
1992	388.7803950462676
1993	449.5258739156065
1994	350.41798501098083
1995	295.94432247239155
1996	236.09102770813556
1997	224.71009894127462
1998	247.90347372478774
1999	213.51045195185813
2000	187.44623406667716
2001	171.24713559255295
2002	120.66970657092992
2003	106.66329469583492
2004	87.38203295232888
2005	76.2787081165696
2006	66.46331400091509
2007	55.11387361146622
2008	44.68219580362285
2009	33.03809013819975
2010	31.902479222272945
2011	25.727082299582314
2012	25.69238657709816
2013	28.029802404346523
2014	25.569126897305058
2015	29.30376786582365
2016	32.76631377099078
2017	30.867946424154123
2018	25.168313387159454
2019	24.773089167580537
2020	23.11464289791771
2021	24.961281003706898
2022	30.708181269937473