Year	billion cubic meters
1962	0.3
1963	0.3
1964	0.3
1965	0.3
1966	0.3
1967	0.3
1968	0.3
1969	0.3
1970	0.3
1971	0.3
1972	0.3
1973	0.3
1974	0.3
1975	0.3
1976	0.3
1977	0.3
1978	0.3
1979	0.3
1980	0.3
1981	0.3
1982	0.3
1983	0.3
1984	0.3
1985	0.3
1986	0.3
1987	0.3
1988	0.3
1989	0.3
1990	0.3
1991	0.3
1992	0.3
1993	0.3
1994	0.3
1995	0.3
1996	0.3
1997	0.3
1998	0.3
1999	0.3
2000	0.3
2001	0.3
2002	0.3
2003	0.3
2004	0.3
2005	0.3
2006	0.3
2007	0.3
2008	0.3
2009	0.3
2010	0.3
2011	0.3
2012	0.3
2013	0.3
2014	0.3
2015	0.3
2016	0.3
2017	0.3
2018	0.3
2019	0.3
2020	0.3