Year	billion cubic meters
1961	44.8
1962	44.8
1963	44.8
1964	44.8
1965	44.8
1966	44.8
1967	44.8
1968	44.8
1969	44.8
1970	44.8
1971	44.8
1972	44.8
1973	44.8
1974	44.8
1975	44.8
1976	44.8
1977	44.8
1978	44.8
1979	44.8
1980	44.8
1981	44.8
1982	44.8
1983	44.8
1984	44.8
1985	44.8
1986	44.8
1987	44.8
1988	44.8
1989	44.8
1990	44.8
1991	44.8
1992	44.8
1993	44.8
1994	44.8
1995	44.8
1996	44.8
1997	44.8
1998	44.8
1999	44.8
2000	44.8
2001	44.8
2002	44.8
2003	44.8
2004	44.8
2005	44.8
2006	44.8
2007	44.8
2008	44.8
2009	44.8
2010	44.8
2011	44.8
2012	44.8
2013	44.8
2014	44.8
2015	44.8
2016	44.8
2017	44.8
2018	44.8
2019	44.8
2020	44.8