Year	billion cubic meters
1961	4858.189
1962	4960.039
1963	4960.039
1964	4960.039
1965	4960.039
1966	4960.039
1967	4960.039
1968	4960.039
1969	4960.039
1970	4960.039
1971	4960.039
1972	4960.039
1973	4960.039
1974	4960.039
1975	4960.039
1976	4960.039
1977	4960.039
1978	4960.039
1979	4960.039
1980	4960.039
1981	4960.039
1982	4960.039
1983	4960.039
1984	4960.039
1985	4960.039
1986	4960.039
1987	4960.039
1988	4960.039
1989	4960.039
1990	4960.039
1991	4960.039
1992	5072.429
1993	5197.229
1994	5183.229
1995	5183.229
1996	5183.229
1997	5183.229
1998	5183.228999999999
1999	5183.229
2000	5183.229
2001	5183.229
2002	5183.228999999999
2003	5183.229
2004	5180.229
2005	5180.229
2006	5180.229
2007	5180.228999999999
2008	5180.228999999999
2009	5180.229
2010	5180.228999999999
2011	5180.228999999999
2012	5210.229
2013	5210.229
2014	5210.229
2015	5210.229
2016	5210.229
2017	5210.229
2018	5210.229
2019	5210.229
2020	5210.229