Year	billion cubic meters
1961	16.14
1962	16.14
1963	16.14
1964	16.14
1965	16.14
1966	16.14
1967	16.14
1968	16.14
1969	16.14
1970	16.14
1971	16.14
1972	16.14
1973	16.14
1974	16.14
1975	16.14
1976	16.14
1977	16.14
1978	16.14
1979	16.14
1980	16.14
1981	16.14
1982	16.14
1983	16.14
1984	16.14
1985	16.14
1986	16.14
1987	16.14
1988	16.14
1989	16.14
1990	16.14
1991	16.14
1992	16.14
1993	16.14
1994	16.14
1995	16.14
1996	16.14
1997	16.14
1998	16.14
1999	16.14
2000	16.14
2001	16.14
2002	16.14
2003	16.14
2004	16.14
2005	16.14
2006	16.14
2007	16.14
2008	16.14
2009	16.14
2010	16.14
2011	16.14
2012	16.14
2013	16.14
2014	16.14
2015	16.14
2016	16.14
2017	16.14
2018	16.14
2019	16.14
2020	16.14