Year	billion cubic meters
1961	26.9
1962	26.9
1963	26.9
1964	26.9
1965	26.9
1966	26.9
1967	26.9
1968	26.9
1969	26.9
1970	26.9
1971	26.9
1972	26.9
1973	26.9
1974	26.9
1975	26.9
1976	26.9
1977	26.9
1978	26.9
1979	26.9
1980	26.9
1981	26.9
1982	26.9
1983	26.9
1984	26.9
1985	26.9
1986	26.9
1987	26.9
1988	26.9
1989	26.9
1990	26.9
1991	26.9
1992	26.9
1993	26.9
1994	26.9
1995	26.9
1996	26.9
1997	26.9
1998	26.9
1999	26.9
2000	26.9
2001	26.9
2002	26.9
2003	26.9
2004	26.9
2005	26.9
2006	26.9
2007	26.9
2008	26.9
2009	26.9
2010	26.9
2011	26.9
2012	26.9
2013	26.9
2014	26.9
2015	26.9
2016	26.9
2017	26.9
2018	26.9
2019	26.9
2020	26.9