Year % of total reserves 1975 7.828204970713151 1976 0 1977 23.00884373965086 1978 14.693939171348386 1979 29.62596245523459 1980 52.38869187083779 1981 77.58973909084906 1982 599.1040308510649 1983 322.3601301961978 1984 480.4076395112661 1985 814.6977696612447 1986 246.08393445170043 1987 353.7022300901817 1988 430.42947221639923 1989 387.9426307854932 1990 991.9967683014285 1991 253.31255910252617 1992 338.67601949196296 1993 311.13573114148426 1994 83.9738484704532 1995 13.395813166528844 1996 16.261386733854277 1997 50.3755933268345 1998 11.284636343922363 1999 36.32035780471368 2000 49.47528350852552 2001 130.5896573602729 2002 187.5033907928585 2003 187.40809474209394 2004 14.920949813767754 2005 6.728523867132978 2006 4.932093503157437 2007 0.024398203095788145 2008 0.04012127341076674 2009 0.008237767158206769 2010 0.0057566556973239055 2011 0.0015599253149915714 2012 0.003302167604435632 2013 0.0033958827332085852 2014 0.040950108909126995 2015 0.21482269240090454 2016 0.04793977645083476 2017 0.09160539762588166 2018 0.004793354014812701 2019 0.6940386434174641 2020 0.003397344283719292 2021 0.003218228808777549 2022 0.003716071896310812