Year	billion cubic meters
1961	2465.967
1962	2513.117
1963	2513.117
1964	2513.117
1965	2513.117
1966	2513.117
1967	2513.117
1968	2513.117
1969	2513.117
1970	2513.117
1971	2513.117
1972	2513.117
1973	2513.117
1974	2513.117
1975	2513.117
1976	2513.117
1977	2513.117
1978	2513.117
1979	2513.117
1980	2513.117
1981	2513.117
1982	2513.117
1983	2513.117
1984	2513.117
1985	2513.117
1986	2513.117
1987	2513.117
1988	2513.117
1989	2513.117
1990	2513.117
1991	2513.117
1992	2513.117
1993	2637.917
1994	2637.917
1995	2637.917
1996	2637.917
1997	2637.917
1998	2637.917
1999	2637.917
2000	2637.917
2001	2637.917
2002	2637.917
2003	2637.917
2004	2637.917
2005	2637.917
2006	2637.917
2007	2637.917
2008	2637.917
2009	2637.917
2010	2637.917
2011	2637.917
2012	2667.917
2013	2667.917
2014	2667.917
2015	2667.917
2016	2667.917
2017	2667.917
2018	2667.917
2019	2667.917
2020	2667.917