Year	% of total reserves
1970	27.659049340294523
1971	25.52531790497309
1972	25.592251897629005
1973	23.199789994652715
1974	18.79852600798166
1975	22.911915912540625
1976	13.382498550289473
1977	7.098911652573871
1978	7.8281737951490555
1979	5.907537382124931
1980	10.583033850097504
1981	19.694560693013244
1982	29.08429359998118
1983	40.629366170892446
1984	43.01808672826807
1985	45.90701282739168
1986	47.1941945098128
1987	49.28012363816345
1988	69.21523108477923
1989	93.19800066339432
1990	151.55798296930536
1991	92.83103501812815
1992	66.46548086175245
1993	24.709316139865738
1994	17.604610019344317
1995	22.082135039041788
1996	27.023590568017802
1997	17.77676132571581
1998	14.12556411718854
1999	10.92339306982777
2000	8.431756273105709
2001	5.590118204589633
2002	5.715852573798176
2003	6.099066206395816
2004	5.214571443353433
2005	6.396525293401176
2006	14.095495417715012
2007	13.049840166187575
2008	17.023122917888617
2009	16.370144459390662
2010	18.785931939534052
2011	26.12711397163413
2012	31.07226070322384
2013	31.099765546476167
2014	26.32400286480384
2015	23.084750583820686
2016	23.205474595890717
2017	23.656163436070198
2018	26.035185409875595
2019	23.039152381649945
2020	17.541223777303802
2021	17.955564267705608
2022	22.768922322082215