Year	% of total reserves
1970	36.94012621209789
1971	53.10922666387686
1972	94.95095071823222
1973	142.4225552239011
1974	590.8594661567768
1975	612.1428252417109
1976	475.88090355864006
1977	282.28292648127467
1978	1247.9708498223858
1979	1850.2096472129683
1980	8722.447939901478
1981	10376.473574981424
1982	47369.529766992746
1983	14111.995914966943
1984	11574.00215830875
1985	27522.151791250002
1986	656.7021747599557
1987	1745.3054324675654
1988	792.6078624111761
1989	817.3647159900621
1990	269.61325119294605
1991	300.57938107715654
1992	179.43227460215786
1993	368.4018458100746
1994	266.453184584947
1995	321.8332060952122
1996	220.50536310453865
1997	131.6849123130575
1998	147.74946327080457
1999	124.83633999987647
2000	85.34306582186056
2001	51.46537887994938
2002	45.81065770347067
2003	40.46848812823758
2004	49.202569976396404
2005	48.965303798741246
2006	44.289027953713095
2007	35.91371976333361
2008	46.949014688302135
2009	40.38608187619096
2010	35.04055583020778
2011	43.577242312049854
2012	50.57176480373741
2013	32.795570777089786
2014	42.5138708020414
2015	53.344923722705694
2016	56.97207366075593
2017	44.46751603691051
2018	51.136351333999464