Year	billion cubic meters
1961	2018.7
1962	2018.7
1963	2018.7
1964	2018.7
1965	2018.7
1966	2018.7
1967	2018.7
1968	2018.7
1969	2018.7
1970	2018.7
1971	2018.7
1972	2018.7
1973	2018.7
1974	2018.7
1975	2018.7
1976	2018.7
1977	2018.7
1978	2018.7
1979	2018.7
1980	2018.7
1981	2018.7
1982	2018.7
1983	2018.7
1984	2018.7
1985	2018.7
1986	2018.7
1987	2018.7
1988	2018.7
1989	2018.7
1990	2018.7
1991	2018.7
1992	2018.7
1993	2018.7
1994	2018.7
1995	2018.7
1996	2018.7
1997	2018.7
1998	2018.7
1999	2018.7
2000	2018.7
2001	2018.7
2002	2018.7
2003	2018.7
2004	2018.7
2005	2018.7
2006	2018.7
2007	2018.7
2008	2018.7
2009	2018.7
2010	2018.7
2011	2018.7
2012	2018.7
2013	2018.7
2014	2018.7
2015	2018.7
2016	2018.7
2017	2018.7
2018	2018.7
2019	2018.7
2020	2018.7