Year	% of total reserves
1993	20.11903838491385
1994	18.718280319417875
1995	18.40745639213113
1996	19.83104891825793
1997	20.120115296226484
1998	21.81147787100457
1999	26.04366537947819
2000	30.497391693147332
2001	26.103516046058235
2002	21.30411427653589
2003	15.224795732279617
2004	13.81205867912906
2009	7.957101992386116
2010	8.001722645612427
2015	12.406446057230314
2016	16.94514222750463
2017	13.792833249803177
2018	12.479851279395216
2019	14.72162282568691
2020	18.113136238513018
2021	21.308985786586554
2022	26.62240433212641