Year	billion cubic meters
1975	1.07
1976	1.236
1977	1.402
1978	1.568
1979	1.734
1980	1.9
1981	1.98
1982	2.06
1983	2.14
1984	2.22
1985	2.3
1986	2.455
1987	2.61
1988	2.765
1989	2.92
1990	3.067
1991	3.0234
1992	2.9798
1993	2.9362
1994	2.8926
1995	2.849
1996	2.8046
1997	2.7602
1998	2.7158
1999	2.6714
2000	2.6
2001	2.809
2002	2.824
2003	2.839
2004	2.854
2005	2.869
2006	2.884
2007	2.899
2008	2.914
2009	3.015
2010	3.116
2011	3.217
2012	3.3188
2013	3.4206
2014	3.5224
2015	3.6242
2016	3.726
2017	3.526
2018	3.78072
2019	3.793
2020	3.864