Year	% of total reserves
1970	106.17625830821497
1971	102.03266228087887
1972	66.6414933695974
1973	50.77040882001619
1974	64.26565752336131
1975	100.44321508322892
1976	85.14717015562982
1977	110.89188151114661
1978	84.30443853383798
1979	85.96016246383059
1980	143.31625067925643
1981	217.1869097420494
1982	332.57351092970526
1983	195.50548856892695
1984	120.59895939915435
1985	98.54951091512658
1986	94.53762682905646
1987	98.02546670832982
1988	124.42005799208177
1989	165.41631444278883
1990	171.36249667507627
1991	146.7234119231387
1992	108.71727784825576
1993	102.91188371046313
1994	117.6222290340265
1995	101.96761698512135
1996	83.86782499532141
1997	85.25956693999449
1998	83.03300489952183
1999	80.50848422198615
2000	76.08991418983824
2001	61.918990931670045
2002	60.242557283714206
2003	56.92787931348648
2004	51.94562618489602
2005	50.06910295347268
2006	38.581712460292835
2007	28.993959749218515
2008	25.14042571480571
2009	21.48779793887284
2010	26.238813017127388
2011	22.296424412448292
2012	22.677985942969833
2013	26.310744502503397
2014	27.301909401004266
2015	29.147185853242252
2016	24.058975754379514
2017	24.173196453746105
2018	29.57018162653516
2019	31.35017163310958
2020	24.634340105726597
2021	25.779915993376758
2022	28.131113128085136