Year	% of total reserves
1970	88.90968647636875
1971	91.55971651510109
1972	82.48092626579486
1973	63.5282775443885
1974	88.9419925907767
1975	125.3669454711164
1976	88.84812005494382
1977	49.89955989858281
1978	27.01934691621566
1979	24.767676516773417
1980	77.77475104544635
1981	57.874989039100996
1982	72.55073461662755
1983	88.36486084076125
1984	36.729675138620195
1985	43.72250394621516
1986	48.93739980051418
1987	88.31803682100244
1988	234.45160885889806
1989	148.79190020304202
1990	90.56868816760954
1991	56.5396507899696
1992	25.49579005760473
1993	16.106978716462848
1994	26.00858077629093
1995	25.347361227637627
1996	28.192224442356896
1997	23.066683068292658
1998	21.029861100719867
1999	56.20947175529817
2000	60.50772710773585
2001	53.92316058015477
2002	55.362404211358
2003	32.47947587521368
2004	46.760150210643666
2005	28.232069468709575
2006	24.417621701483817
2007	38.012024532926986
2008	104.14526836510285
2009	66.37596020025951
2010	33.57164615286343
2011	53.05936002126715
2012	90.32626209196238
2013	90.34340481895956
2014	89.21466144671038
2015	103.9104986006135
2016	123.3791474334454
2017	100.6511529679253
2018	118.21057149415061
2019	110.3742014316895
2020	148.2355065861182
2021	274.98790086438316