Year	% of total reserves
1970	50.11358285940081
1971	46.93561136833017
1972	35.2877418203557
1973	31.871659908732326
1974	23.219719985187627
1975	37.01527581710241
1976	42.257801725312845
1977	92.68713614286459
1978	71.10641854080205
1979	80.11033454817603
1980	95.55730030625817
1981	157.22054169252812
1982	196.22551218542532
1983	312.65771125585064
1984	426.96922056029945
1985	348.2415385226394
1986	158.81444034901983
1987	115.24857271003175
1988	44.00992319008582
1989	36.148152003833694
1990	17.429304569854807
1991	8.9166140158027
1992	10.15368319576372
1993	8.01676320968653
1994	4.812138316912617
1995	5.11181985972039
1996	35.33474324559417
1997	51.48118154217095
1998	39.720614932373266
1999	34.38712800234547
2000	31.35507904876591
2001	19.459515155536153
2002	16.411319809656554
2003	8.857243190333296
2004	1.0739221629679987
2005	4.120686603108451
2006	8.330610148359474
2007	7.764964686804994
2008	7.178843557028502
2009	9.378431333877572
2010	11.586603979930887
2011	19.025216861743687
2012	24.316261110061536
2013	28.465370630553704
2014	37.52418051694962
2015	30.186298615313735
2016	35.55384258689193
2017	28.285970469218253
2018	30.438703713775507
2019	32.92129710715578
2020	22.63008581053498
2021	25.46723619464239
2022	30.775987010507578