Year	% of total reserves
1996	65.70741609619218
1997	75.54100755415553
1998	89.70726167520309
1999	82.34433429864664
2000	59.673399412559874
2003	51.64879827948014
2004	48.13192517318355
2015	47.17097987506727
2016	50.912417013083655
2017	52.258977565504
2018	22.718515581063308
2019	26.18721708267934
2020	30.58544915129761
2021	33.704656220365365
2022	30.23355422096943