Year	billion cubic meters
1961	12667.300000000001
1962	12667.300000000001
1963	12667.300000000001
1964	12667.300000000001
1965	12667.300000000001
1966	12667.300000000001
1967	12667.300000000001
1968	12667.300000000001
1969	12667.300000000001
1970	12667.300000000001
1971	12667.300000000001
1972	12667.300000000001
1973	12667.300000000001
1974	12667.300000000001
1975	12667.300000000001
1976	12667.300000000001
1977	12667.300000000001
1978	12667.300000000001
1979	12667.300000000001
1980	12667.300000000001
1981	12667.300000000001
1982	12667.300000000001
1983	12667.300000000001
1984	12667.300000000001
1985	12667.300000000001
1986	12667.300000000001
1987	12667.300000000001
1988	12667.300000000001
1989	12667.300000000001
1990	12667.300000000001
1991	12667.300000000001
1992	12731.08
1993	12756.829999999998
1994	12756.829999999998
1995	12756.829999999998
1996	12756.829999999998
1997	12756.829999999998
1998	12756.829999999998
1999	12756.829999999998
2000	12756.829999999998
2001	12756.829999999998
2002	12756.829999999998
2003	12756.829999999998
2004	12756.829999999998
2005	12756.829999999998
2006	12756.829999999998
2007	12756.829999999998
2008	12756.829999999998
2009	12756.829999999998
2010	12756.829999999998
2011	12756.829999999998
2012	12756.829999999998
2013	12756.829999999998
2014	12756.829999999998
2015	12756.829999999998
2016	12756.829999999998
2017	12756.829999999998
2018	12756.829999999998
2019	12756.829999999998
2020	12756.829999999998