Year	billion cubic meters
1961	120.6
1962	120.6
1963	120.6
1964	120.6
1965	120.6
1966	120.6
1967	120.6
1968	120.6
1969	120.6
1970	120.6
1971	120.6
1972	120.6
1973	120.6
1974	120.6
1975	120.6
1976	120.6
1977	120.6
1978	120.6
1979	120.6
1980	120.6
1981	120.6
1982	120.6
1983	120.6
1984	120.6
1985	120.6
1986	120.6
1987	120.6
1988	120.6
1989	120.6
1990	120.6
1991	120.6
1992	120.6
1993	120.6
1994	120.6
1995	120.6
1996	120.6
1997	120.6
1998	120.6
1999	120.6
2000	120.6
2001	120.6
2002	120.6
2003	120.6
2004	120.6
2005	120.6
2006	120.6
2007	120.6
2008	120.6
2009	120.6
2010	120.6
2011	120.6
2012	120.6
2013	120.6
2014	120.6
2015	120.6
2016	120.6
2017	120.6
2018	120.6
2019	120.6
2020	120.6