Year	billion cubic meters
1961	42.38
1962	42.38
1963	42.38
1964	42.38
1965	42.38
1966	42.38
1967	42.38
1968	42.38
1969	42.38
1970	42.38
1971	42.38
1972	42.38
1973	42.38
1974	42.38
1975	42.38
1976	42.38
1977	42.38
1978	42.38
1979	42.38
1980	42.38
1981	42.38
1982	42.38
1983	42.38
1984	42.38
1985	42.38
1986	42.38
1987	42.38
1988	42.38
1989	42.38
1990	42.38
1991	42.38
1992	42.38
1993	42.38
1994	42.38
1995	42.38
1996	42.38
1997	42.38
1998	42.38
1999	42.38
2000	42.38
2001	42.38
2002	42.38
2003	42.38
2004	42.38
2005	42.38
2006	42.38
2007	42.38
2008	42.38
2009	42.38
2010	42.38
2011	42.38
2012	42.38
2013	42.38
2014	42.38
2015	42.38
2016	42.38
2017	42.38
2018	42.38
2019	42.38
2020	42.38