Year	billion cubic meters
1961	2850
1962	2850
1963	2850
1964	2850
1965	2850
1966	2850
1967	2850
1968	2850
1969	2850
1970	2850
1971	2850
1972	2850
1973	2850
1974	2850
1975	2850
1976	2850
1977	2850
1978	2850
1979	2850
1980	2850
1981	2850
1982	2850
1983	2850
1984	2850
1985	2850
1986	2850
1987	2850
1988	2850
1989	2850
1990	2850
1991	2850
1992	2850
1993	2850
1994	2850
1995	2850
1996	2850
1997	2850
1998	2850
1999	2850
2000	2850
2001	2850
2002	2850
2003	2850
2004	2850
2005	2850
2006	2850
2007	2850
2008	2850
2009	2850
2010	2850
2011	2850
2012	2850
2013	2850
2014	2850
2015	2850
2016	2850
2017	2850
2018	2850
2019	2850
2020	2850