Year	% of total reserves
1970	6.171062757427873
1971	126.71204871920196
1972	31.172410061907613
1973	50.08760731829073
1974	82.36840674591932
1975	56.99670792461053
1976	22.30437598890644
1977	61.209162782697334
1978	62.22019188877995
1979	48.18605015141394
1980	39.842467409456056
1981	26.35654466029809
1982	37.6952027753434
1983	29.21231541278953
1984	23.714642657011833
1985	33.94282125689049
1986	40.57147949734047
1987	28.773123642586633
1988	33.98165628036973
1989	31.298095013930688
1990	30.708101157715518
1991	41.11491112867067
1992	51.90873926970785
1993	62.86912985658076
1994	20.657419918350588
1995	24.01219066922998
1996	23.161964413322895
1997	34.56633788352615
1998	40.382361086715605
1999	43.1798652415051
2000	27.919069696086822
2001	27.842483273978917
2002	41.923274630965594
2003	73.80488493431491
2004	73.06417645876803
2005	75.17941573417484
2006	86.29904510723048
2007	107.26887123809557
2008	67.88358215498013
2009	40.600269048556534
2010	47.42667974848365
2011	71.94011066356602
2012	54.11870256936029
2013	45.70559537661775
2014	34.16726728847403
2015	42.243349419330265
2016	36.97359004704719
2017	24.47393957224374
2018	24.432002267787578
2019	37.756777660938226
2020	30.698955595329373
2021	33.54538592059116
2022	27.17450216725778