Year	billion cubic meters
1961	8853.730999999998
1962	8916.645999999997
1963	8916.645999999997
1964	8916.645999999999
1965	8916.645999999999
1966	8916.645999999997
1967	8916.645999999999
1968	8916.645999999999
1969	8916.645999999999
1970	8916.645999999997
1971	8916.645999999997
1972	8916.646
1973	8916.646
1974	8916.645999999999
1975	8916.645999999997
1976	8916.645999999997
1977	8916.645999999997
1978	8916.646
1979	8916.645999999997
1980	8916.645999999997
1981	8916.645999999997
1982	8916.645999999997
1983	8916.645999999997
1984	8916.645999999997
1985	8916.645999999999
1986	8916.645999999999
1987	8916.645999999997
1988	8916.645999999997
1989	8916.645999999999
1990	8916.645999999999
1991	8916.645999999997
1992	9100.475999999999
1993	9100.475999999999
1994	9086.475999999997
1995	9086.475999999999
1996	9086.475999999999
1997	9086.475999999997
1998	9086.475999999999
1999	9086.476
2000	9086.475999999999
2001	9086.475999999999
2002	9086.475999999997
2003	9086.475999999999
2004	9083.475999999999
2005	9083.475999999999
2006	9083.475999999999
2007	9083.475999999997
2008	9083.475999999999
2009	9083.475999999999
2010	9083.475999999997
2011	9083.475999999997
2012	9083.475999999999
2013	9083.475999999999
2014	9083.475999999999
2015	9083.475999999999
2016	9083.475999999999
2017	9083.475999999999
2018	9083.475999999999
2019	9083.475999999999
2020	9083.475999999997