Year	billion cubic meters
1961	8674.8525
1962	8674.8525
1963	8674.8525
1964	8674.8525
1965	8674.8525
1966	8674.8525
1967	8674.8525
1968	8674.8525
1969	8674.8525
1970	8674.8525
1971	8674.852499999999
1972	8674.8525
1973	8674.8525
1974	8674.8525
1975	8674.8525
1976	8674.852499999999
1977	8674.852499999999
1978	8674.852499999999
1979	8674.852499999999
1980	8674.8525
1981	8674.8525
1982	8674.8525
1983	8674.852499999999
1984	8674.852499999999
1985	8674.852499999999
1986	8674.852499999999
1987	8674.8525
1988	8674.8525
1989	8674.8525
1990	8674.8525
1991	8674.852499999999
1992	8871.2825
1993	8884.4325
1994	8884.4325
1995	8884.432499999999
1996	8884.4325
1997	8884.4325
1998	8884.432499999999
1999	8884.4325
2000	8884.4325
2001	8884.432499999999
2002	8884.4325
2003	8884.4325
2004	8884.4325
2005	8884.4325
2006	8884.4325
2007	8884.4325
2008	8884.4325
2009	8884.432499999999
2010	8884.4325
2011	8884.4325
2012	8884.4325
2013	8884.432499999999
2014	8884.4325
2015	8884.4325
2016	8884.432499999999
2017	8884.4325
2018	8884.432499999999
2019	8884.432499999999
2020	8884.4325