Year	% of total reserves
1977	65.07915734501354
1978	61.461980914719064
1979	35.03553491955471
1980	32.91431017714742
1981	39.00524848668143
1982	55.32113199503156
1983	48.800165773196156
1984	55.22180375391918
1985	40.09014448366676
1986	82.03191901373127
1987	30.28712827606687
1988	50.79105365071355
1989	59.620130090964
1990	29.2616452791867
1991	35.810064043577285
1992	23.93215872075382
1993	19.19949831131381
1994	13.224600881429998
1995	6.261741634849441
1996	5.2067196824252
1997	1.67748112436246
1998	2.200709920965976
1999	3.1788721441326127
2000	1.6387005741479141
2001	1.0122975104059095
2002	0.4275956191878709
2003	0.41045562693555115
2004	0.9428765383490338
2005	0.8721253391571857
2006	0.6638876414335513
2007	0.6520615813531613
2008	0.8803186487777547
2009	0.9621827434542951
2010	1.0431820849544335
2011	0.5965570886692125
2012	0.6007371241693679
2013	0.6592644886350401
2014	1.0597927264450635
2015	1.2105827764497064
2016	1.6441273462640107
2017	1.9992934125946882
2018	2.654054432280015
2019	3.153896532396694
2020	3.000855273726696
2021	2.8404402204463586
2022	2.427452204684982