Year	% of total reserves
1970	42.526811847208734
2000	104.38456409598294
2001	100.89383450341957
2002	100.77706456126556
2003	100.31125563411977
2004	68.41144984404325
2005	47.065319271425075
2006	32.48756312011507
2007	28.669982298397873
2015	21.015973391803165
2016	19.94131574483261
2017	25.92304954336907
2018	16.997840727989473
2019	20.488946238371735
2020	22.815737175711472
2021	20.788163912938618
2022	20.242419754935007