Year	billion cubic meters
1961	13801.806
1962	13821.706
1963	13821.706
1964	13821.706
1965	13821.706
1966	13821.706
1967	13821.706
1968	13821.706
1969	13821.706
1970	13821.706
1971	13821.706
1972	13821.706
1973	13821.706
1974	13821.706
1975	13821.706
1976	13821.706
1977	13821.706
1978	13821.706
1979	13821.706
1980	13821.706
1981	13821.706
1982	13821.706
1983	13821.706
1984	13821.706
1985	13821.706
1986	13821.706
1987	13821.706
1988	13821.706
1989	13821.706
1990	13821.706
1991	13821.706
1992	13821.706
1993	13821.706
1994	13821.706
1995	13821.706
1996	13821.706
1997	13821.706
1998	13821.706
1999	13821.706
2000	13821.706
2001	13821.706
2002	13821.706
2003	13821.706
2004	13821.706
2005	13821.706
2006	13821.706
2007	13821.706
2008	13821.706
2009	13821.706
2010	13821.706
2011	13821.706
2012	13821.706
2013	13821.706
2014	13821.706
2015	13821.706
2016	13821.706
2017	13821.706
2018	13821.706
2019	13821.706
2020	13821.706