Year	% of total reserves
1970	28.1595503087212
1972	40.43711293609244
1973	40.15476972264543
1974	51.38116222048349
1975	91.93795762364259
1976	99.25513663797788
1977	126.1128781788975
1978	167.74972578457627
1979	136.33040930029588
1980	158.24835202438692
1981	197.04611150339377
1982	259.7877775918262
1983	231.34376288540585
1984	330.82037850298235
1985	400.84040783767904
1986	190.93924340787615
1987	183.59241041891346
1988	198.9216618267679
1989	271.77471726762593
1990	259.14525430935333
1991	233.26332728309856
1992	216.048219465561
1993	207.4603451153327
1994	170.44864918556797
1995	184.44137014106897
1996	164.3756660396755
1997	156.45599954821597
1998	167.52545517917085
1999	151.99244212540165
2000	118.53769291043007
2001	108.11698796023124
2002	76.53930385230792
2003	66.68485168110894
2004	59.2766715069578
2005	58.35601435195102
2006	45.460481023749445
2007	39.43714488081536
2008	32.87024319899822
2009	27.16982450828281
2010	27.997134909289173
2011	23.19023781044631
2012	23.38370285519301
2013	25.8704349514693
2014	23.761765996214198
2015	25.500489067512444
2016	24.93326190238965
2017	26.917323433168228
2018	20.382743838018396
2019	20.317504946966487
2020	21.2433840536587
2021	29.000601660195784
2022	35.93264328071588