Year	% of total reserves
1970	33.71830665179483
1971	32.52147767883871
1972	26.22260707741223
1973	23.701558807009594
1974	20.782574664901812
1975	25.873432320466318
1976	16.775615732635483
1977	10.778807602388682
1978	10.6238496197622
1979	9.917689007207208
1980	16.923266331092528
1981	28.589353944215215
1982	33.5525881628409
1983	39.274670033805634
1984	44.46971596398501
1985	50.91809748490745
1986	55.12409335079249
1987	57.52449518895966
1988	78.1233811493259
1989	102.24202545599475
1990	149.32630259170836
1991	103.65716322096866
1992	77.28262311453656
1993	27.862025484611152
1994	20.533912594409312
1995	29.458162989348182
1996	33.269100523698015
1997	23.599742757232402
1998	18.991641893778585
1999	16.424230799734502
2000	12.80743382368075
2001	9.149739633445932
2002	8.475519313350185
2003	7.390565583315181
2004	6.617706354905571
2005	7.416269700312181
2006	14.216938952882431
2007	13.554229494595685
2008	17.89807391539409
2009	16.829895246246544
2010	19.32537769965662
2011	25.517480115299826
2012	30.60846989497525
2013	31.35516295081757
2014	26.76648179943354
2015	24.250371336423385
2016	24.37604880309547
2017	25.640954169627932
2018	27.798056569631527
2019	25.092229684983238
2020	19.2819578766661
2021	20.948872888122757
2022	25.31529124416015