Year	billion cubic meters
1961	156.21
1962	156.21
1963	156.21
1964	156.21
1965	156.21
1966	156.21
1967	156.21
1968	156.21
1969	156.21
1970	156.21
1971	156.21
1972	156.21
1973	156.21
1974	156.21
1975	156.21
1976	156.21
1977	156.21
1978	156.21
1979	156.21
1980	156.21
1981	156.21
1982	156.21
1983	156.21
1984	156.21
1985	156.21
1986	156.21
1987	156.21
1988	156.21
1989	156.21
1990	156.21
1991	156.21
1992	156.21
1993	156.21
1994	156.21
1995	156.21
1996	156.21
1997	156.21
1998	156.21
1999	156.21
2000	156.21
2001	156.21
2002	156.21
2003	156.21
2004	156.21
2005	156.21
2006	156.21
2007	156.21
2008	156.21
2009	156.21
2010	156.21
2011	156.21
2012	156.21
2013	156.21
2014	156.21
2015	156.21
2016	156.21
2017	156.21
2018	156.21
2019	156.21
2020	156.21