Year	% of total reserves
1970	92.78880742517805
1971	85.55234843700859
1972	61.43505654264611
1973	46.55553199773452
1974	43.33233671672015
1975	53.196568839696674
1976	57.69094215730152
1977	93.50117549768848
1978	87.16086375138968
1979	87.7492950125735
1980	137.060511065784
1981	193.2479611934581
1982	260.6337231086056
1983	171.72775058056342
1984	110.18338470539814
1985	91.38060824130994
1986	76.48703799741595
1987	86.32509544692121
1988	118.95240175646835
1989	139.1176497130832
1990	135.8677962788889
1991	120.09557475614248
1992	100.1349189877254
1993	96.16089267987779
1994	108.5584873861816
1995	96.62545739517456
1996	76.46347759741343
1997	80.5401534211422
1998	80.28942582224833
1999	76.96333411972802
2000	72.82893339536068
2001	61.55952239290196
2002	59.68230789438918
2003	53.91637830351864
2004	49.67204183414117
2005	47.767839288251544
2006	37.94413243399588
2007	31.178434404889042
2008	32.72024856777292
2009	28.45791157028338
2010	32.88660510048544
2011	28.926066439877914
2012	29.447689523069023
2013	34.20474593317595
2014	35.31472191286204
2015	39.827417552717264
2016	35.01706358604293
2017	34.20369187778765
2018	34.39399776765316
2019	35.91749780098346
2020	28.68794915441921
2021	25.76232147850479
2022	28.10525200765766