Year	billion cubic meters
1991	0.9799
1992	1.056075
1993	1.13225
1994	1.208425
1995	1.2846
1996	1.2964142857
1997	1.3082285714
1998	1.3200428571
1999	1.3318571429
2000	1.3436714286
2001	1.3554857143
2002	1.3673
2003	1.3791142857
2004	1.3909285714
2005	1.4027428571
2006	1.4145571429
2007	1.4263714286
2008	1.4381857143
2009	1.45
2010	1.45
2011	1.45
2012	1.45
2013	1.45
2014	1.45
2015	1.45
2016	1.45
2017	1.45
2018	1.45
2019	1.45
2020	1.45