Year	% of total reserves
1977	7.879070818068669
1978	8.121277744691108
1979	16.36732249299435
1980	7.746600100418865
1981	12.424360946092087
1982	21.662575459516223
1983	17.84549287768325
1984	12.891239175415189
1985	7.920222072585241
1986	10.85124291322983
1987	14.849525945470537
1988	56.78532125270841
1989	68.363826449849
1990	73.12848770621322
1991	78.10714490111691
1992	44.378961746522414
1993	160.57895130111524
1994	49.968793610871735
1995	39.82300088586771
1996	58.25412432249865
1997	18.703346781409238
1998	136.87817400769032
1999	46.53376315705488
2000	30.421053763440863
2001	77.77206438978564
2002	86.40707140179643
2003	75.97846181117067
2004	59.4106809497294
2005	7.800782494208273
2006	32.848978625473165
2007	40.66696966949663
2008	60.96078679577602
2009	29.672584249147715
2010	31.536076576414917
2011	13.11059487971755
2012	59.27842463365931
2013	30.848872161038965
2014	46.47841856403827
2015	9.59131286837976
2016	12.89131799951598
2017	11.066645276717752
2018	7.155631120626676
2019	5.859346781019996
2020	34.82744084531761
2021	34.563902976580316
2022	17.398766723501392