Year	% of total reserves
1977	73.50215039008242
1978	86.27910585396602
1979	69.02831100765077
1980	57.636109966030055
1981	76.5535243511175
1982	59.89454218014581
1983	27.835663752700462
1984	36.09628388386007
1985	25.275146962433897
1986	36.11631836377009
1987	52.040161675310955
1988	68.97320046254933
1989	46.39462822194169
1990	35.79155433923232
1991	23.591908964445473
1992	18.40477137425295
1993	15.546777178063637
1994	23.006136342799078
1995	56.19701552438671
1996	54.000885563200605
1997	56.12549682297634
1998	48.58795044284748
1999	53.82963875720752
2000	86.51815355786859
2001	110.65045854929232
2002	71.25214703857846
2003	81.55244169652389
2004	91.9329982339179
2005	100.2459414353372
2006	65.40733657166545
2007	56.105485288041756
2008	58.32543858830254
2009	27.66013086505946
2010	29.004413277384433
2011	49.04287844285898
2012	48.05570794900015
2013	67.50703327753381
2014	74.92669148692443
2015	72.403755590775
2016	78.21709333151531
2017	57.28063722770952
2018	58.01599561420952
2019	50.213338845372824
2020	60.69721863031842
2021	65.90588297861292