Year	billion cubic meters
1961	28702.663
1962	28861.188
1963	28861.187999999995
1964	28861.188000000002
1965	28861.188
1966	28861.187999999995
1967	28861.187999999995
1968	28861.188
1969	28861.187999999995
1970	28861.187999999995
1971	28861.188
1972	28861.187999999995
1973	28861.187999999995
1974	28861.188
1975	28861.188
1976	28861.188
1977	28861.187999999995
1978	28861.187999999995
1979	28861.187999999995
1980	28861.188000000002
1981	28861.187999999995
1982	28861.187999999995
1983	28861.188
1984	28861.187999999995
1985	28861.188000000002
1986	28861.187999999995
1987	28861.187999999995
1988	28861.188
1989	28861.188
1990	28861.188
1991	28861.188
1992	33610.09699999999
1993	33734.897
1994	33720.89699999998
1995	33720.89699999998
1996	33719.996999999996
1997	33720.89699999999
1998	33720.89699999998
1999	33720.89699999998
2000	33720.89699999998
2001	33720.89699999998
2002	33720.89699999998
2003	33720.89699999998
2004	33717.89699999998
2005	33717.89699999999
2006	33726.30399999998
2007	33726.30399999998
2008	33726.30399999998
2009	33726.30399999998
2010	33726.30399999998
2011	33726.30399999998
2012	33756.30399999998
2013	33756.30399999999
2014	33756.30399999998
2015	33756.30399999998
2016	33756.30399999998
2017	33756.303999999975
2018	33756.30399999999
2019	33756.30399999998
2020	33756.30399999999