Year	billion cubic meters
1961	22239.214
1962	22258.324
1963	22258.324
1964	22258.324
1965	22258.324
1966	22258.324
1967	22258.324
1968	22258.324
1969	22258.324
1970	22258.324
1971	22258.324
1972	22258.324
1973	22258.324
1974	22258.324
1975	22258.324
1976	22258.324
1977	22258.324
1978	22258.324
1979	22258.324
1980	22258.324
1981	22258.324
1982	22258.324
1983	22258.324
1984	22258.324
1985	22258.324
1986	22258.324
1987	22258.324
1988	22258.324
1989	22258.324
1990	22258.324
1991	22258.324
1992	26878.502999999997
1993	26878.502999999997
1994	26878.502999999997
1995	26878.502999999997
1996	26877.602999999996
1997	26878.502999999997
1998	26878.502999999997
1999	26878.502999999997
2000	26878.502999999997
2001	26878.502999999997
2002	26878.502999999997
2003	26878.502999999997
2004	26878.502999999997
2005	26878.502999999997
2006	26886.909999999996
2007	26886.909999999996
2008	26886.909999999996
2009	26886.909999999996
2010	26886.909999999996
2011	26886.909999999996
2012	26886.909999999996
2013	26886.909999999996
2014	26886.909999999996
2015	26886.909999999996
2016	26886.909999999996
2017	26886.909999999996
2018	26886.909999999996
2019	26886.909999999996
2020	26886.909999999996