Year	billion cubic meters
1961	3728.9610000000002
1962	3728.9610000000002
1963	3728.9610000000002
1964	3728.9610000000002
1965	3728.9610000000002
1966	3728.9610000000002
1967	3728.9610000000002
1968	3728.9610000000007
1969	3728.9610000000002
1970	3728.9610000000007
1971	3728.9610000000002
1972	3728.9610000000002
1973	3728.9610000000002
1974	3728.9610000000002
1975	3728.9610000000002
1976	3728.9610000000002
1977	3728.9610000000002
1978	3728.9610000000002
1979	3728.9610000000002
1980	3728.9610000000002
1981	3728.9610000000002
1982	3728.9610000000002
1983	3728.9610000000002
1984	3728.9610000000002
1985	3728.9610000000002
1986	3728.9610000000002
1987	3728.9610000000002
1988	3728.9610000000002
1989	3728.9610000000002
1990	3728.9610000000002
1991	3728.9610000000002
1992	3728.9610000000002
1993	3853.7610000000004
1994	3853.7610000000013
1995	3853.7610000000004
1996	3853.7610000000004
1997	3853.7610000000013
1998	3853.761000000001
1999	3853.761000000001
2000	3853.761000000001
2001	3853.761000000001
2002	3853.7610000000004
2003	3853.7610000000004
2004	3853.7610000000013
2005	3853.7610000000004
2006	3853.7610000000004
2007	3853.7610000000004
2008	3853.761000000001
2009	3853.7610000000013
2010	3853.761000000001
2011	3853.7610000000004
2012	3883.7610000000004
2013	3883.7610000000004
2014	3883.761000000001
2015	3883.761000000001
2016	3883.7610000000004
2017	3883.7610000000004
2018	3883.761000000001
2019	3883.761000000001
2020	3883.7610000000004