Year	billion cubic meters
1961	8691.130000000001
1962	8782.595000000001
1963	8782.595000000001
1964	8782.595000000001
1965	8782.595000000001
1966	8782.595000000001
1967	8782.595000000001
1968	8782.595000000001
1969	8782.595000000001
1970	8782.595000000001
1971	8782.595000000001
1972	8782.595000000001
1973	8782.595000000001
1974	8782.595000000001
1975	8782.595000000001
1976	8782.595000000001
1977	8782.595000000001
1978	8782.595000000001
1979	8782.595000000001
1980	8782.595000000001
1981	8782.595000000001
1982	8782.595000000001
1983	8782.595000000001
1984	8782.595000000001
1985	8782.595000000001
1986	8782.595000000001
1987	8782.595000000001
1988	8782.595000000001
1989	8782.595000000001
1990	8782.595000000001
1991	8782.595
1992	8782.595000000001
1993	8782.595000000001
1994	8782.595000000001
1995	8782.595000000001
1996	8782.595000000001
1997	8782.595000000001
1998	8782.595000000001
1999	8782.595000000001
2000	8782.595000000001
2001	8782.595000000001
2002	8782.595000000001
2003	8782.595000000001
2004	8782.595000000001
2005	8782.595000000001
2006	8782.595000000001
2007	8782.595000000001
2008	8782.595000000001
2009	8782.595000000001
2010	8782.595000000001
2011	8782.595000000001
2012	8782.595000000001
2013	8782.595000000001
2014	8782.595000000001
2015	8782.595000000001
2016	8782.595000000001
2017	8782.595000000001
2018	8782.595000000001
2019	8782.595000000001
2020	8782.595000000001