Year	billion cubic meters
1961	4666.371
1962	4766.436
1963	4766.436
1964	4766.436
1965	4766.436
1966	4766.436
1967	4766.436
1968	4766.436
1969	4766.436
1970	4766.436
1971	4766.436
1972	4766.436
1973	4766.436
1974	4766.436
1975	4766.436
1976	4766.436
1977	4766.436
1978	4766.436
1979	4766.436
1980	4766.436
1981	4766.436
1982	4766.436
1983	4766.436
1984	4766.436
1985	4766.436
1986	4766.436
1987	4766.436
1988	4766.436
1989	4766.436
1990	4766.436
1991	4766.436
1992	4821.535999999999
1993	4946.335999999999
1994	4946.335999999999
1995	4946.335999999999
1996	4946.335999999999
1997	4946.335999999999
1998	4946.335999999999
1999	4946.335999999999
2000	4946.335999999999
2001	4946.335999999999
2002	4946.335999999999
2003	4946.335999999999
2004	4946.335999999999
2005	4946.335999999999
2006	4946.335999999999
2007	4946.335999999999
2008	4946.335999999999
2009	4946.335999999999
2010	4946.335999999999
2011	4946.335999999999
2012	4976.335999999999
2013	4976.335999999999
2014	4976.335999999999
2015	4976.335999999999
2016	4976.335999999999
2017	4976.335999999999
2018	4976.335999999999
2019	4976.335999999999
2020	4976.335999999999