Year	% of total reserves
1977	14.251555591556325
1978	8.984874626413133
1979	5.100544587840842
1980	2.574012285347281
1981	8.394824084880463
1982	14.531691974548
1983	41.8706390306122
1984	18.66251106411764
1985	21.80768618785105
1986	14.669708375532034
1987	8.343515393156526
1988	9.041599715119588
1989	7.765529159353137
1990	6.84841855285437
1991	5.624916941912565
1992	1.0611761547994083
1993	2.958565697937114
1994	8.330236154239499
1995	3.541508370589894
1996	4.1014288145827456
1997	4.234347095849484
1998	3.8629763632539915
1999	4.78284020312953
2000	2.937178669522386
2001	5.000185590810802
2002	3.738304455145559
2003	4.276026365429512
2004	2.354326096056073
2005	3.0028043893283383
2006	4.184991779619119
2007	2.730839262675703
2008	2.3190395321465225
2009	1.5605791169056857
2010	2.0314881743152027
2011	2.2687360146915636
2012	2.557869826400198
2013	4.593221710573231
2014	5.355185658367857
2015	4.289921408430045
2016	4.333442712302284
2017	4.464213811198974
2018	3.018652924365629
2019	4.623485779786511
2020	3.143584837148646
2021	3.4759982908681373
2022	3.4539844358552925