Year	billion cubic meters
1961	932.5305000000001
1962	932.5305000000001
1963	932.5305000000001
1964	932.5305000000001
1965	932.5305000000001
1966	932.5305000000001
1967	932.5305000000001
1968	932.5305000000001
1969	932.5305000000001
1970	932.5305000000001
1971	932.5305000000001
1972	932.5305000000001
1973	932.5305000000001
1974	932.5305000000001
1975	932.5305000000001
1976	932.5305000000001
1977	932.5305000000001
1978	932.5305000000001
1979	932.5305000000001
1980	932.5305000000001
1981	932.5305000000001
1982	932.5305000000001
1983	932.5305000000001
1984	932.5305000000001
1985	932.5305000000001
1986	932.5305000000001
1987	932.5305000000001
1988	932.5305000000001
1989	932.5305000000001
1990	932.5305000000001
1991	932.5305000000001
1992	996.3105000000002
1993	1008.9105000000002
1994	1008.9105000000002
1995	1008.9105000000002
1996	1008.9105000000002
1997	1008.9105000000002
1998	1008.9105000000002
1999	1008.9105000000002
2000	1008.9105000000002
2001	1008.9105000000002
2002	1008.9105000000002
2003	1008.9105000000002
2004	1008.9105000000002
2005	1008.9105000000002
2006	1008.9105000000002
2007	1008.9105000000002
2008	1008.9105000000002
2009	1008.9105000000002
2010	1008.9105000000002
2011	1008.9105000000002
2012	1008.9105000000002
2013	1008.9105000000002
2014	1008.9105000000002
2015	1008.9105000000002
2016	1008.9105000000002
2017	1008.9105000000002
2018	1008.9105000000002
2019	1008.9105000000002
2020	1008.9105000000002