Year	billion cubic meters
1962	3.84
1963	3.84
1964	3.84
1965	3.84
1966	3.84
1967	3.84
1968	3.84
1969	3.84
1970	3.84
1971	3.84
1972	3.84
1973	3.84
1974	3.84
1975	3.84
1976	3.84
1977	3.84
1978	3.84
1979	3.84
1980	3.84
1981	3.84
1982	3.84
1983	3.84
1984	3.84
1985	3.84
1986	3.84
1987	3.84
1988	3.84
1989	3.84
1990	3.84
1991	3.84
1992	3.84
1993	3.84
1994	3.84
1995	3.84
1996	3.84
1997	3.84
1998	3.84
1999	3.84
2000	3.84
2001	3.84
2002	3.84
2003	3.84
2004	3.84
2005	3.84
2006	3.84
2007	3.84
2008	3.84
2009	3.84
2010	3.84
2011	3.84
2012	3.84
2013	3.84
2014	3.84
2015	3.84
2016	3.84
2017	3.84
2018	3.84
2019	3.84
2020	3.84