Year	% of total reserves
1970	73.45829546798889
1971	33.00085810474413
1972	23.874637595303547
1973	20.244143214148338
1974	16.70929375849474
1975	20.353277536370307
1976	24.26688692505357
1977	53.48372202278727
1978	58.669272122419436
1979	28.506474104102235
1980	19.470682754395945
1981	21.87428169151695
1982	19.704167738873135
1983	20.5847024618263
1984	36.4946180067581
1985	62.397314016269
1986	60.45270009177401
1987	41.3800847927485
1988	34.28621862506097
1989	36.23679950408857
1990	73.18545832572197
1991	77.38385485248429
1992	91.21494460200107
1993	84.12739735170608
1994	71.63390350070001
1995	77.55803100235956
1996	79.68899368919344
1997	75.40299703277508
1998	54.39332398232515
1999	66.1481498958094
2000	84.96190044981404
2001	128.9536956130645
2002	130.27792371645705
2003	107.52057930845905
2004	82.97917680963013
2005	68.92551294930158
2006	48.260659129855355
2007	49.61394971534934
2008	47.90548980325669
2009	42.81125401759562
2010	50.99060688227699
2011	63.57330480192641
2012	71.45802174040627
2013	87.04351077061524
2014	91.30014128379528
2015	86.97629769037319
2016	109.07471322706587
2017	121.39296709512313
2018	142.95214108794846
2019	144.32658886090553
2020	108.37121624136404
2021	152.4946352562672
2022	169.04830373184453