Year	% of total reserves
1993	20.11903838491385
1994	18.71828031941788
1995	18.407456392131134
1996	19.83104891825793
1997	20.12011529622648
1998	21.81147787100457
1999	26.043665379478192
2000	30.497391693147335
2001	26.103516046058235
2002	21.30411427653589
2003	15.224795732279622
2004	13.812058679129057
2009	7.957101992386116
2010	8.001722645612427
2015	12.406446057230319
2016	16.94514222750463
2017	13.792833249803177
2018	12.479851279395216
2019	14.72162282568691
2020	18.11313623851302
2021	21.308985786586554
2022	26.62240433212641