Year	% of total reserves
1980	73.01086833333537
1981	126.12752007843446
1982	132.1320186431708
1983	109.51603989715855
1984	101.26869097287718
1985	100.0432016450019
1986	91.56148711523778
1987	79.99931016339363
1988	90.1939763309074
1989	98.11623027321242
1990	97.8501185315731
1991	84.53633473109602
1992	88.18058407583726
1993	84.22350282059844
1994	74.57829025627635
1995	75.4932353718715
1996	66.76963943774301
1997	62.61395371927978
1998	52.08583026766705
1999	46.333393441927555
2000	41.58601363787411
2001	39.98121056837413
2002	33.90955628761456
2003	31.07709246116334
2004	27.85484613575599
2005	26.035975236884376
2006	23.2048399234026
2007	19.588606303297446
2008	16.623362217668994
2009	15.582962949943465
2010	22.182564979762244
2011	25.74988649069786
2012	26.648052713211644
2013	30.339240108619098
2014	32.72242224718369
2015	27.139843939133918
2016	27.4969610412339
2017	31.560133038430127
2018	35.97803277920395
2019	35.04170397038229
2020	33.16113865017747
2021	36.5688700479652
2022	36.98922206866699