Year	billion cubic meters
1994	11.52
1995	11.6515
1996	11.783
1997	11.9145
1998	12.046
1999	12.1775
2000	12.309
2001	12.1233
2002	11.9376
2003	11.7519
2004	11.5662
2005	11.3805
2006	11.1948
2007	11.1086888889
2008	11.0225777778
2009	10.9364666667
2010	10.8503555556
2011	10.7642444444
2012	10.6781333333
2013	10.5920222222
2014	10.5059111111
2015	10.4198
2016	8.749
2017	7.988
2018	9.774
2019	10.602
2020	10.602