Year	% of total reserves
1970	68.74275395002957
1971	64.30464633370313
1972	57.21515267596043
1973	47.20651155005802
1974	27.704606343309262
1975	38.1745613857207
1976	39.80099869877413
1977	64.00849356460239
1978	67.0594201969182
1979	48.085776871025594
1980	52.99487974852546
1981	91.9256561884843
1982	105.76833021003324
1983	121.66320583368781
1984	148.99741681504395
1985	148.82334047180225
1986	110.73358956724871
1987	98.12813161043387
1988	111.18713777838809
1989	117.56500763287387
1990	116.63736511334072
1991	82.67881418179662
1992	68.90524218453488
1993	48.50349582908624
1994	39.95800264993742
1995	48.917824210210725
1996	47.4173215454607
1997	48.128668125723685
1998	41.0958280862965
1999	37.380840679195146
2000	31.22293477452873
2001	27.814894163548445
2002	23.50915160467607
2003	18.98368154092636
2004	17.095001940108858
2005	16.514667656540563
2006	17.64873559624123
2007	16.618883642825562
2008	18.26054317780254
2009	16.91040488080998
2010	20.64081927685817
2011	25.29523456874999
2012	29.453430866927405
2013	29.720145311633264
2014	27.401641987896344
2015	25.657668052769864
2016	25.793283907179656
2017	26.715675590186542
2018	26.877665881776576
2019	26.206261427031098
2020	22.2677130248737
2021	24.390411354387464
2022	32.01350062614963