Year	billion cubic meters
1992	1.46
1993	1.4825
1994	1.505
1995	1.5275
1996	1.55
1997	1.5725
1998	1.595
1999	1.6175
2000	1.64
2001	1.62464
2002	1.60928
2003	1.59392
2004	1.57856
2005	1.5632
2006	1.5395
2007	1.5158
2008	1.4921
2009	1.4684
2010	1.4447
2011	1.4447
2012	1.4447
2013	1.4447
2014	1.4447
2015	1.4447
2016	1.4447
2017	1.4447
2018	1.4447
2019	1.4447
2020	1.4447