Year	% of total reserves
1970	42.6787277142209
1971	50.92439660839938
1972	47.29619997470151
1973	45.12087141473986
1974	22.690127821103577
1975	28.61657573424562
1976	30.753967817240216
1977	71.7624125944372
1978	112.69567550261515
1979	64.69541257432599
1980	62.66624884529955
1981	121.20857793923848
1982	139.74372246819112
1983	158.07504894561507
1984	200.35250304933328
1985	216.01141525810692
1986	168.95463763422626
1987	173.2157623984928
1988	199.54377893653222
1989	189.38900713756115
1990	178.7463647085984
1991	157.488476767958
1992	203.78512909021305
1993	173.43223439420692
1994	141.10860385366044
1995	156.8690256860295
1996	130.6284057820914
1997	112.17915044208644
1998	119.67547690116386
1999	114.32197463708236
2000	74.07036322755535
2001	62.78266545389064
2002	51.751537782791516
2003	46.04332111439625
2004	41.25464375280554
2005	33.3130475086985
2006	27.27448705268984
2007	26.2180457893345
2008	24.390177557266984
2009	21.881237476216434
2010	25.841096422686917
2011	28.13481920942806
2012	30.351170892131968
2013	29.88053798957874
2014	28.761118121996116
2015	29.385569080983416
2016	28.55835889095179
2017	33.505720936272766
2018	29.50604753047118
2019	32.969213551782566
2020	29.013677491905007
2021	34.41362987288699
2022	41.283831111464586