Year	billion cubic meters
1992	1.963
1993	1.85265
1994	1.7423
1995	1.63195
1996	1.5216
1997	1.4889545455
1998	1.4563090909
1999	1.4236636364
2000	1.3910181818
2001	0.874
2002	0.866
2003	0.864
2004	0.852
2005	0.852
2006	0.854
2007	0.854
2008	0.885
2009	0.865
2010	0.851
2011	0.847
2012	0.85
2013	0.839
2014	0.837
2015	0.84
2016	0.843
2017	0.84
2018	0.837
2019	0.839
2020	0.846