Year	% of total reserves
1976	0.025023776435994637
1977	17.6921926515778
1978	7.238433534879189
1979	13.518978025438926
1980	18.553037487837177
1981	25.807469347509116
1982	15.046895647124343
1983	20.478998670794745
1984	18.860259970045735
1985	17.172694291426627
1986	12.284969386470001
1987	12.153456184915983
1988	11.450483321726848
1989	6.972402670696027
1990	11.39102758989694
1991	10.586409955125644
1992	7.202547261533008
1993	13.361861322720006
1994	5.73001632431269
1995	6.229967373490141
1996	4.41819419389339
1997	7.681013478524615
1998	2.2388644590654847
1999	1.0447990638275106
2000	5.742509206868745
2001	9.777023671953593
2002	19.83195232514184
2003	20.408491346088628
2004	15.445378400574743
2005	21.069692482471897
2006	6.625563151123146
2007	5.277707285936101
2008	8.049302344482811
2009	7.932124706496296
2010	9.270142065235078
2011	15.376285291843258
2012	4.580680074346952
2013	4.370056090357858
2014	10.618435292125593
2015	8.643696180695526
2016	10.046455703163183
2017	7.8126999007633335
2018	6.304808014810603
2019	6.154529015138872
2020	4.249893782490062
2021	5.236167249528402
2022	7.121194048112722