Year	billion cubic meters
1991	8.5984
1992	10.0701619048
1993	11.5419238095
1994	13.0136857143
1995	12.8521142857
1996	12.2795428571
1997	11.7069714286
1998	11.1344
1999	10.9010335338
2000	10.6646670677
2001	10.4313006015
2002	10.1979341353
2003	9.9645676692
2004	9.731201203
2005	9.4978347368
2006	9.0587968421
2007	9.146
2008	9.0792888889
2009	9.0125777778
2010	8.9458666667
2011	8.8791555556
2012	8.8124444444
2013	8.7457333333
2014	8.6790222222
2015	8.6123111111
2016	8.5456
2017	6.16147
2018	6.12953
2019	6.12953
2020	6.12953