Year	billion cubic meters
1961	34.8
1962	34.8
1963	34.8
1964	34.8
1965	34.8
1966	34.8
1967	34.8
1968	34.8
1969	34.8
1970	34.8
1971	34.8
1972	34.8
1973	34.8
1974	34.8
1975	34.8
1976	34.8
1977	34.8
1978	34.8
1979	34.8
1980	34.8
1981	34.8
1982	34.8
1983	34.8
1984	34.8
1985	34.8
1986	34.8
1987	34.8
1988	34.8
1989	34.8
1990	34.8
1991	34.8
1992	34.8
1993	34.8
1994	34.8
1995	34.8
1996	34.8
1997	34.8
1998	34.8
1999	34.8
2000	34.8
2001	34.8
2002	34.8
2003	34.8
2004	34.8
2005	34.8
2006	34.8
2007	34.8
2008	34.8
2009	34.8
2010	34.8
2011	34.8
2012	34.8
2013	34.8
2014	34.8
2015	34.8
2016	34.8
2017	34.8
2018	34.8
2019	34.8
2020	34.8