Year	% of total reserves
1970	0
1971	0
1972	0.02791131785247932
1973	0.09980664950748122
1974	1.5178290921708975
1975	2.26481923670306
1976	0
1977	248.3519218330364
1978	294.8289657492223
1979	172.2334789747727
1980	134.83198238263208
1981	260.64836097666813
1982	500.1700356048456
1983	196.61729392619046
1984	622.0741686735201
1985	384.0053733761576
1986	1129.029713930726
1987	979.1160210866572
1988	434.6010237914971
1989	652.2368123370635
1990	2524.5512709993404
1991	1800.2440274378002
1992	2619.5241823027122
1993	6334.357347168357
1994	5126.408245659016
1995	6444.432811318481
1996	8763.130025338663
1997	13391.987325175356
1998	13164.834972857276
1999	9127.009332010342
2000	555.8167325418174
2001	271.76419652466535
2002	114.95720604103903
2003	55.29188101738093
2004	65.04153606806081
2005	34.60162867343026
2006	28.413220002004874
2007	8.100703799365125
2008	1.2960289044583522
2009	0.06908993981503128
2010	0.23825229806711912
2011	2.125947825236169
2012	4.649611513120053
2013	12.745450388536153
2014	5.584546012210375
2015	8.45109393760979
2016	11.792805841680533
2017	16.504423723938576
2018	12.525489905282164
2019	10.141036034159749
2020	9.294119553211004
2021	15.173799809820403
2022	17.11517291740345