Year	% of total reserves
1970	0.0381288614298323
1971	0.08532034494086413
1972	0.49523158619462004
1973	0.7043001913352659
1974	2.0007799210089874
1975	3.9839137902539
1976	5.394580273803269
1977	7.890926232490498
1978	16.280882093827557
1979	192.14428932125404
1980	2093.4801
1981	102.64250679616929
1982	50.38363999645451
1983	25.88707397716706
1984	57.68948639454161
1985	148.91140100984728
1986	212.87821057924072
1987	111.81401758241758
1988	165.46383245436107
1989	777.9704446808511
1990	332.75989207274074
1991	293.9195399735576
1992	168.22420705141758
1993	71.42959390519302
1994	39.9889384910525
1995	22.32955676085087
1996	21.917726689015055
1997	19.43594489465717
1998	19.682227647813903
1999	17.261609090513694
2000	16.022249438143128
2001	15.358171971373705
2002	16.96855662758224
2003	13.685262508508918
2004	10.298767990791923
2005	5.854442462540129
2006	8.17656931787578
2007	1.0335411136809474
2008	19.91847065226767
2009	7.8552235292993915
2010	0.9690109367826761
2011	1.0017948713653482
2012	0.827918411462741
2013	14.065498362441264
2014	16.069783822930333
2015	19.056845875809074
2016	16.20195778132635
2017	12.714665834275799
2018	15.150582839193438