Year	% of total reserves
2008	0.6036335749288201
2009	0.5005453822221908
2010	2.035234983471188
2011	1.2658181109650606
2012	1.582773620988295
2013	1.45293353564213
2014	2.3121883667243157
2015	4.125012960574594
2016	4.869042941769669
2017	5.799058814400429
2018	5.285156636760751
2019	4.940915590272396
2020	4.4633951754095955