Year	% of total reserves
1970	30.185264862088356
1971	33.36866313628874
1972	30.307815133448518
1973	23.341358254169307
1974	20.049387360481226
1975	25.56060146909973
1976	30.29086603439933
1977	57.24340551318585
1978	81.89590786961007
1979	75.48889944270573
1980	76.10048568482443
1981	105.7932995040769
1982	113.73047866115616
1983	129.31085601138372
1984	132.13933670123882
1985	106.5486684792607
1986	75.2012541055123
1987	51.17456380313891
1988	67.48827044911395
1989	58.16408081005895
1990	58.368663297544785
1991	67.91917979207858
1992	69.52178881281309
1993	88.97328734149099
1994	96.3622685502416
1995	119.37304253489623
1996	123.47127478077414
1997	140.6677154017368
1998	100.41587991349203
1999	67.33000654847821
2000	45.55265532079814
2001	40.02057337766992
2002	30.63749921242226
2003	25.98561968337275
2004	23.04670325616063
2005	30.751337146748675
2006	26.58199050443028
2007	20.915152697305288
2008	18.42675001825213
2009	24.046111063357156
2010	29.446995942925174
2011	27.038807483161847
2012	32.058734390961355
2013	37.01264562420815
2014	35.66262333576581
2015	33.603459450948044
2016	31.706211945571113
2017	33.938368511004796
2018	30.832808831402538
2019	26.646183947704476
2020	28.985878724078734
2021	30.382516930091306
2022	36.30903747254725