Year	billion cubic meters
1961	1898.4399999999998
1962	1898.4399999999998
1963	1898.4399999999998
1964	1898.4399999999998
1965	1898.4399999999998
1966	1898.4399999999998
1967	1898.4399999999998
1968	1898.4399999999998
1969	1898.4399999999998
1970	1898.4399999999998
1971	1898.4399999999998
1972	1898.4399999999998
1973	1898.4399999999998
1974	1898.4399999999998
1975	1898.4399999999998
1976	1898.4399999999998
1977	1898.4399999999998
1978	1898.4399999999998
1979	1898.4399999999998
1980	1898.4399999999998
1981	1898.4399999999998
1982	1898.4399999999998
1983	1898.4399999999998
1984	1898.4399999999998
1985	1898.4399999999998
1986	1898.4399999999998
1987	1898.4399999999998
1988	1898.4399999999998
1989	1898.4399999999998
1990	1898.4399999999998
1991	1898.4399999999998
1992	1898.4399999999998
1993	1898.4399999999998
1994	1898.4399999999998
1995	1898.4399999999998
1996	1898.4399999999998
1997	1898.4399999999998
1998	1898.4399999999998
1999	1898.4399999999998
2000	1898.4399999999998
2001	1898.4399999999998
2002	1898.4399999999998
2003	1898.4399999999998
2004	1898.4399999999998
2005	1898.4399999999998
2006	1898.44
2007	1898.44
2008	1898.44
2009	1898.44
2010	1898.44
2011	1898.44
2012	1898.44
2013	1898.44
2014	1898.4399999999998
2015	1898.4399999999998
2016	1898.44
2017	1898.44
2018	1898.44
2019	1898.44
2020	1898.44