Year	billion cubic meters
1970	2
1971	2.1
1972	2.2
1973	2.3
1974	2.4
1975	2.5
1976	2.6
1977	2.7
1978	2.8
1979	2.9
1980	3
1981	3.1
1982	3.2
1983	3.3
1984	3.4
1985	3.5
1986	3.7
1987	3.9
1988	4.1
1989	4.3
1990	4.436
1991	4.5557090909
1992	4.6754181818
1993	4.7951272727
1994	4.9148363636
1995	5.0345454545
1996	5.1542545455
1997	5.2739636364
1998	5.3936727273
1999	5.5133818182
2000	5.6330909091
2001	5.8071666667
2002	6.0436060606
2003	6.2202454545
2004	6.3968848485
2005	6.5735242424
2006	6.7501636364
2007	6.9268030303
2008	7.1034424242
2009	7.2800818182
2010	7.4567212121
2011	7.6333606061
2012	7.8
2013	8.1846666667
2014	8.5693333333
2015	8.954
2016	9.23
2017	9.802
2018	9.802
2019	9.802
2020	9.802