Year	% of total reserves
1973	51.16360488057425
1974	39.74451645386966
1975	65.14334655369191
1976	61.666028061378434
1982	75.8852802798765
1983	74.03148287759743
1984	77.25997514818344
1985	90.04961580321941
1986	72.11808700372133
1987	55.88898060316643
1988	60.65679342758432
1989	57.66787800244115
1990	55.262222677427815
1991	52.07087961134681
1992	82.22134034138952
1993	85.19085664240477
1994	65.82316576959182
1995	70.87234157582274
1996	63.39405333814167
1997	57.48181330723158
1998	34.37322946909836
1999	27.311096853797896
2000	22.253241754293203
2001	31.983848954165
2002	26.104683445646298
2003	24.33082490293948
2004	21.357193649514297
2005	19.47175905712182
2006	17.192193182121635
2007	14.418363518409107
2008	10.939203588345753
2009	11.29164247618926
2010	18.811080439642424
2011	24.178773646082917
2012	24.283817672796815
2013	28.46533579864912
2014	32.011168412970065
2015	24.912197944092124
2016	26.390842415799955
2017	31.899898774491653
2018	37.5086807131503
2019	35.960859108341516
2020	35.09395189012027
2021	39.948824202091956
2022	37.67627920787945