Year	% of total reserves
1970	0.6309183387549012
1971	1.4676710959683605
1972	1.7817682282670204
1973	0.5926246152072088
1974	0.28009075109940884
1975	0.4939196912908729
1976	1.5191964696313618
1977	84.79403205392524
1978	145.37233660044296
1979	107.70815075630324
1980	172.16625658320328
1981	226.49114856382297
1982	311.26061781441035
1983	148.41787534079168
1984	143.2354773986438
1985	105.146659566522
1986	80.10319758478329
1987	150.09932372270345
1988	142.82587699175087
1989	287.2264989078251
1990	1141.4099531592003
1991	125.38077209171217
1992	135.83755112319952
1993	126.33622163772
1994	166.25655057529036
1995	165.27112850658722
1996	197.95853522250565
1997	189.3154489763803
1998	170.58416384328876
1999	149.74206866254193
2000	180.9399466848844
2001	113.72386505776642
2002	413.5467653915839
2003	368.98307593453023
2004	110.77426267069386
2005	45.9686385485059
2006	61.32477093124652
2007	81.45131896002154
2008	71.99007169699037
2009	49.016256361313246
2010	45.27806629661698
2011	43.74847281149557
2012	49.268320184811145
2013	37.29375216281951
2014	51.13828989859096
2015	60.375291012979616
2016	49.764278328524355
2017	29.121132647614413
2018	28.343006777126927
2019	28.350494443719455
2020	20.024699344693968
2021	17.60541535432764
2022	21.812018524523445