Year	% of total reserves
1970	278.3193656853726
1971	189.96415770609318
1972	171.4087714234058
1973	123.91892144389409
1974	123.1165419808208
1975	591.1592103718986
1976	1235.6431021186443
1977	1993.1740668330353
1978	1954.8536332400924
1979	776.9494814335561
1980	1228.3136879870788
1981	5187.807905755362
1982	4499.2263448780495
1983	4387.245418261412
1984	8030.635351162792
1985	11235.124694262295
1986	2465.972666216551
1987	16041.692572894994
1988	18566.25526563277
1989	22060.13441584065
1990	36404.05704711056
1991	59755.55625076647
1992	18340.597621130466
1993	14491.20081341504
1994	7730.270159276335
1995	3898.1725091648846
1996	5818.888063556173
1997	7397.4518053646
1998	7005.969878781255
1999	3216.017183619737
2000	3444.165062790642
2001	8725.606284947866
2002	1943.2816701193688
2003	1027.1664900329479
2004	449.1479765358712
2005	308.7861874033282
2006	359.49087939969604
2007	473.8047054266822
2008	485.2917849641854
2009	619.8223652985777
2010	703.6507202479679
2011	2867.7102678346023
2012	2885.8712380222278
2013	2861.5478017789337
2014	2937.268105386775
2015	2970.6889709200855
2016	3054.1598967655545
2017	3051.2272661312613