Year	billion cubic meters
1961	24370.807
1962	24478.332000000002
1963	24478.332000000002
1964	24478.332
1965	24478.331999999995
1966	24478.332000000002
1967	24478.332
1968	24478.331999999995
1969	24478.332
1970	24478.332000000002
1971	24478.332
1972	24478.332000000002
1973	24478.332000000002
1974	24478.332
1975	24478.332
1976	24478.332
1977	24478.332
1978	24478.332000000002
1979	24478.332000000002
1980	24478.332
1981	24478.332000000002
1982	24478.332000000002
1983	24478.332000000002
1984	24478.332000000002
1985	24478.332
1986	24478.332
1987	24478.332000000002
1988	24478.332000000002
1989	24478.332000000002
1990	24478.332000000002
1991	24478.332
1992	29189.541
1993	29189.541
1994	29175.541
1995	29175.541
1996	29174.641000000003
1997	29175.541
1998	29175.541
1999	29175.541
2000	29175.541
2001	29175.541
2002	29175.541
2003	29175.540999999994
2004	29172.540999999994
2005	29172.541
2006	29180.948
2007	29180.948
2008	29180.947999999993
2009	29180.947999999997
2010	29180.948
2011	29180.948
2012	29180.948
2013	29180.947999999997
2014	29180.947999999993
2015	29180.947999999993
2016	29180.948
2017	29180.948
2018	29180.947999999997
2019	29180.947999999997
2020	29180.948