Year	billion cubic meters
1961	15.63
1962	15.63
1963	15.63
1964	15.63
1965	15.63
1966	15.63
1967	15.63
1968	15.63
1969	15.63
1970	15.63
1971	15.63
1972	15.63
1973	15.63
1974	15.63
1975	15.63
1976	15.63
1977	15.63
1978	15.63
1979	15.63
1980	15.63
1981	15.63
1982	15.63
1983	15.63
1984	15.63
1985	15.63
1986	15.63
1987	15.63
1988	15.63
1989	15.63
1990	15.63
1991	15.63
1992	15.63
1993	15.63
1994	15.63
1995	15.63
1996	15.63
1997	15.63
1998	15.63
1999	15.63
2000	15.63
2001	15.63
2002	15.63
2003	15.63
2004	15.63
2005	15.63
2006	15.63
2007	15.63
2008	15.63
2009	15.63
2010	15.63
2011	15.63
2012	15.63
2013	15.63
2014	15.63
2015	15.63
2016	15.63
2017	15.63
2018	15.63
2019	15.63
2020	15.63