Year	billion cubic meters
1961	11825.653999999997
1962	11895.814
1963	11895.813999999998
1964	11895.813999999997
1965	11895.814
1966	11895.813999999997
1967	11895.813999999997
1968	11895.813999999998
1969	11895.813999999997
1970	11895.813999999997
1971	11895.813999999998
1972	11895.814
1973	11895.814
1974	11895.813999999998
1975	11895.813999999998
1976	11895.814
1977	11895.814
1978	11895.814
1979	11895.814
1980	11895.813999999998
1981	11895.813999999998
1982	11895.813999999998
1983	11895.813999999998
1984	11895.813999999998
1985	11895.813999999998
1986	11895.813999999998
1987	11895.814
1988	11895.814
1989	11895.813999999997
1990	11895.813999999997
1991	11895.814
1992	11977.018999999998
1993	12099.018999999997
1994	12085.018999999998
1995	12085.018999999998
1996	12085.018999999998
1997	12085.018999999998
1998	12085.019
1999	12085.018999999998
2000	12085.019
2001	12085.019
2002	12085.018999999998
2003	12085.018999999998
2004	12082.018999999998
2005	12082.018999999998
2006	12082.018999999998
2007	12082.018999999998
2008	12082.018999999998
2009	12082.018999999998
2010	12082.018999999998
2011	12082.018999999998
2012	12082.018999999998
2013	12082.018999999998
2014	12082.018999999998
2015	12082.018999999998
2016	12082.018999999998
2017	12082.018999999998
2018	12082.018999999998
2019	12082.018999999998
2020	12082.019