Year	billion cubic meters
1961	858.2605000000001
1962	969.6355
1963	969.6355
1964	969.6354999999999
1965	969.6355
1966	969.6355
1967	969.6355
1968	969.6355
1969	969.6355
1970	969.6355
1971	969.6354999999999
1972	969.6354999999999
1973	969.6355000000001
1974	969.6355000000001
1975	969.6355000000001
1976	969.6354999999999
1977	969.6355000000001
1978	969.6355000000001
1979	969.6355000000001
1980	969.6355000000001
1981	969.6355
1982	969.6355000000001
1983	969.6355000000001
1984	969.6355000000001
1985	969.6355000000001
1986	969.6355
1987	969.6355
1988	969.6355000000001
1989	969.6355
1990	969.6355
1991	969.6355000000001
1992	982.3455
1993	982.3454999999999
1994	968.3455000000001
1995	968.3455
1996	968.3454999999999
1997	968.3454999999999
1998	968.3455
1999	968.3454999999999
2000	968.3454999999999
2001	968.3455
2002	968.3454999999999
2003	968.3455000000001
2004	965.3455000000001
2005	965.3455000000001
2006	965.3454999999999
2007	965.3454999999999
2008	965.3454999999999
2009	965.3455000000001
2010	965.3454999999999
2011	965.3454999999999
2012	965.3454999999999
2013	965.3454999999999
2014	965.3454999999999
2015	965.3454999999999
2016	965.3454999999999
2017	965.3454999999999
2018	965.3454999999999
2019	965.3455000000001
2020	965.3454999999999