Year	% of total reserves
1976	0
1977	3.102592097149874
1978	2.0417219026111155
1979	6.557383718723661
1980	1.1974797600378249
1981	3.3798389609423043
1982	1.0867530770019853
1983	1.0631738641391208
1984	1.1017414762731885
1985	0.2637314392626494
1986	0.26794712229191786
1987	0.2114216393433523
1988	0.16939452213640746
1989	0.12751371833447275
1990	0.17339141650355283
1991	0.17840635369274827
1992	0.16618623453591533
1993	0.18936323477848968
1994	0.25511627205440446
1995	0.21709218923305598
1996	0.11957860492293082
1997	0.7048453981811096
1998	0.12507003941145683
1999	0.31643196855828337
2000	0.14244531760948823
2001	0.271312892848675
2002	0.2374898211313372
2003	0.4307296890503932
2004	0.3709309527104293
2005	0.6657096912661193
2006	0
2007	0.2247250443414525
2008	0.4935116575303137
2009	1.8152656281820574
2010	4.565508694562467
2011	5.035952728053343
2012	5.453613259174347
2013	5.141707267461902
2014	5.03978750965208
2015	5.0966685907340485
2016	5.270335137906943
2017	1.4391538872996756
2018	3.7684548012427497
2019	2.2560779991734528
2020	4.4074009418580395
2021	3.2482445540578073
2022	2.6173473528961173