Year	% of total reserves
1970	132.53376935973478
1971	109.83655146811682
1972	91.07845595836088
1973	90.00980010756139
1974	104.43204714911722
1975	138.2339359888231
1976	245.54700705921562
1977	281.32340382897075
1978	217.95123012891383
1979	259.87353580269587
1980	387.1080690953612
1981	502.54857418857
1982	1474.3737534206023
1983	211.68285952519233
1984	80.41080396915532
1985	95.96962499132383
1986	88.40885043379731
1987	42.36054748609586
1988	124.53632052904081
1989	128.5117230343298
1990	157.40671112455664
1991	121.07754764186308
1992	127.97737501922298
1993	143.3172245995056
1994	610.4675656537131
1995	218.82767706899196
1996	152.80756331112758
1997	96.56155224118496
1998	82.60694119258851
1999	75.6000898510149
2000	53.21373782250998
2001	32.488579256394004
2002	47.18830621154598
2003	38.768895905164555
2004	31.637791590230623
2005	29.95694085608364
2006	34.40091404103306
2007	31.375498581762663
2008	25.370724086235384
2009	25.58328464856674
2010	35.710337277245635
2011	35.141188791216635
2012	45.44373971152132
2013	51.33819749105811
2014	41.64011270300857
2015	36.46070427648054
2016	26.402833433569572
2017	25.01538881576494
2018	31.824567910969538
2019	30.295124708815358
2020	23.29735015818756
2021	22.637666682310424
2022	27.22992080680342