Year	billion cubic meters
1961	230.47850000000003
1962	230.47850000000003
1963	230.47850000000003
1964	230.47850000000003
1965	230.47850000000003
1966	230.47850000000003
1967	230.47850000000003
1968	230.47850000000003
1969	230.47850000000003
1970	230.47850000000003
1971	230.47850000000003
1972	230.47850000000003
1973	230.47850000000003
1974	230.47850000000003
1975	230.47850000000003
1976	230.47850000000003
1977	230.47850000000003
1978	230.47850000000003
1979	230.47850000000003
1980	230.47850000000003
1981	230.47850000000003
1982	230.47850000000003
1983	230.47850000000003
1984	230.47850000000003
1985	230.47850000000003
1986	230.47850000000003
1987	230.47850000000003
1988	230.47850000000003
1989	230.47850000000003
1990	230.47850000000003
1991	230.47850000000003
1992	230.47850000000003
1993	230.47850000000003
1994	230.47850000000003
1995	230.47850000000003
1996	230.47850000000003
1997	230.47850000000003
1998	230.47850000000003
1999	230.47850000000003
2000	230.47850000000003
2001	230.47850000000003
2002	230.47850000000003
2003	230.47850000000003
2004	230.47850000000003
2005	230.47850000000003
2006	230.47850000000003
2007	230.47850000000003
2008	230.47850000000003
2009	230.47850000000003
2010	230.47850000000003
2011	230.47850000000003
2012	230.47850000000003
2013	230.47850000000003
2014	230.47850000000003
2015	230.47850000000003
2016	230.47850000000003
2017	230.47850000000003
2018	230.47850000000003
2019	230.47850000000003
2020	230.47850000000003