Year	billion cubic meters
1961	1232.5105
1962	1232.5105
1963	1232.5105
1964	1232.5105
1965	1232.5105
1966	1232.5105
1967	1232.5105
1968	1232.5105
1969	1232.5105
1970	1232.5105
1971	1232.5105
1972	1232.5105
1973	1232.5105
1974	1232.5105
1975	1232.5105
1976	1232.5105
1977	1232.5105
1978	1232.5105
1979	1232.5105
1980	1232.5105
1981	1232.5105
1982	1232.5105
1983	1232.5105
1984	1232.5105
1985	1232.5105
1986	1232.5105
1987	1232.5105
1988	1232.5105
1989	1232.5105
1990	1232.5105
1991	1232.5105
1992	1333.9905000000003
1993	1359.7405
1994	1359.7405
1995	1359.7405
1996	1359.7405
1997	1359.7405
1998	1359.7405
1999	1359.7405
2000	1359.7405
2001	1359.7405
2002	1359.7405
2003	1359.7405
2004	1359.7405
2005	1359.7405
2006	1359.7405
2007	1359.7405
2008	1359.7405
2009	1359.7405
2010	1359.7405
2011	1359.7405
2012	1359.7405
2013	1359.7405
2014	1359.7405
2015	1359.7405
2016	1359.7405
2017	1359.7405
2018	1359.7405
2019	1359.7405
2020	1359.7405