Year	% of total reserves
1988	136.2401678860274
1989	149.39877397246414
1990	147.89860420272146
1991	144.08554873190948
1992	138.7082688888581
1993	148.56184528431933
1994	162.27011276314775
1995	166.21491565054205
1996	175.53279392857513
1997	139.3709418284819
1998	153.56237718169848
1999	122.4264756131895
2000	102.019637324219
2001	96.87136365192892
2002	78.79443261343471
2003	87.03548169363924
2004	71.86855308161168
2005	69.53718909377876
2006	66.39526048976268
2007	60.170625432820295
2008	59.74931925769187
2009	52.99700942199622
2010	53.479158134434044
2011	44.9831373939124
2012	51.76871015646879
2013	54.19654391019194
2014	58.391508118379136
2015	57.727363458296196
2016	56.612681346735215
2017	60.27698169254085
2018	61.286519465103716
2019	57.62583908380755
2020	57.05617691090066
2021	53.13348661502467
2022	62.60862105484036