Year	billion cubic meters
1961	99
1962	99
1963	99
1964	99
1965	99
1966	99
1967	99
1968	99
1969	99
1970	99
1971	99
1972	99
1973	99
1974	99
1975	99
1976	99
1977	99
1978	99
1979	99
1980	99
1981	99
1982	99
1983	99
1984	99
1985	99
1986	99
1987	99
1988	99
1989	99
1990	99
1991	99
1992	99
1993	99
1994	99
1995	99
1996	99
1997	99
1998	99
1999	99
2000	99
2001	99
2002	99
2003	99
2004	99
2005	99
2006	99
2007	99
2008	99
2009	99
2010	99
2011	99
2012	99
2013	99
2014	99
2015	99
2016	99
2017	99
2018	99
2019	99
2020	99