Year	billion cubic meters
1961	1830.5210000000004
1962	1830.5210000000002
1963	1830.5210000000004
1964	1830.5210000000004
1965	1830.5210000000002
1966	1830.5210000000004
1967	1830.5210000000004
1968	1830.5210000000002
1969	1830.5210000000004
1970	1830.5210000000004
1971	1830.5210000000004
1972	1830.5210000000004
1973	1830.5210000000004
1974	1830.5210000000004
1975	1830.5210000000004
1976	1830.5210000000002
1977	1830.5210000000002
1978	1830.5210000000004
1979	1830.5210000000004
1980	1830.5210000000004
1981	1830.5210000000004
1982	1830.5210000000004
1983	1830.5210000000004
1984	1830.5210000000004
1985	1830.5210000000004
1986	1830.5210000000004
1987	1830.5210000000004
1988	1830.5210000000002
1989	1830.5210000000002
1990	1830.5210000000002
1991	1830.5210000000002
1992	1830.5210000000002
1993	1955.3210000000001
1994	1955.3210000000001
1995	1955.3210000000001
1996	1955.3210000000004
1997	1955.3210000000001
1998	1955.3210000000004
1999	1955.3210000000004
2000	1955.3210000000004
2001	1955.3210000000004
2002	1955.3210000000001
2003	1955.3210000000004
2004	1955.3210000000004
2005	1955.3210000000004
2006	1955.3210000000004
2007	1955.3210000000004
2008	1955.3210000000004
2009	1955.3210000000004
2010	1955.3210000000004
2011	1955.3210000000004
2012	1985.3210000000004
2013	1985.3210000000001
2014	1985.3210000000004
2015	1985.3210000000004
2016	1985.3210000000004
2017	1985.3210000000004
2018	1985.3210000000001
2019	1985.3210000000004
2020	1985.3210000000004