Year	% of total reserves
1970	92.78880742517805
1971	85.55234843700859
1972	61.4350565426461
1973	46.55553199773452
1974	43.33233671672015
1975	53.196568839696674
1976	57.69094215730151
1977	93.50117549768848
1978	87.16086375138968
1979	87.74929501257351
1980	137.060511065784
1981	193.2479611934581
1982	260.6337231086056
1983	171.72775058056345
1984	110.18338470539811
1985	91.38060824130993
1986	76.48703799741597
1987	86.32509544692121
1988	118.95240175646838
1989	139.1176497130832
1990	135.8677962788889
1991	120.0955747561425
1992	100.13491898772537
1993	96.16089267987778
1994	108.55848738618155
1995	96.62545739517455
1996	76.46347759741343
1997	80.54015342114221
1998	80.28942582224836
1999	76.96333411972799
2000	72.82893339536066
2001	61.55952239290196
2002	59.68230789438918
2003	53.91637830351864
2004	49.67204183414117
2005	47.767839288251544
2006	37.94413243399588
2007	31.178434404889042
2008	32.72024856777293
2009	28.457911570283382
2010	32.88660510048544
2011	28.926066439877925
2012	29.447689523069023
2013	34.20474593317596
2014	35.31472191286204
2015	39.827417552717264
2016	35.01706358604294
2017	34.20369187778765
2018	34.39399776765316
2019	35.91749780098347
2020	28.68794915441921
2021	25.76232147850479
2022	28.105252007657672