Year	billion cubic meters
1961	11921.05
1962	11937.11
1963	11937.11
1964	11937.11
1965	11937.11
1966	11937.11
1967	11937.11
1968	11937.11
1969	11937.11
1970	11937.11
1971	11937.11
1972	11937.11
1973	11937.11
1974	11937.11
1975	11937.11
1976	11937.11
1977	11937.11
1978	11937.11
1979	11937.11
1980	11937.11
1981	11937.11
1982	11937.109999999999
1983	11937.11
1984	11937.11
1985	11937.11
1986	11937.11
1987	11937.109999999999
1988	11937.11
1989	11937.11
1990	11937.11
1991	11937.11
1992	11937.11
1993	11937.11
1994	11937.11
1995	11937.11
1996	11937.11
1997	11937.11
1998	11937.11
1999	11937.11
2000	11937.11
2001	11937.11
2002	11937.11
2003	11937.11
2004	11937.11
2005	11937.11
2006	11937.11
2007	11937.11
2008	11937.11
2009	11937.11
2010	11937.11
2011	11937.11
2012	11937.11
2013	11937.11
2014	11937.11
2015	11937.11
2016	11937.11
2017	11937.11
2018	11937.11
2019	11937.11
2020	11937.11