Year	billion cubic meters
1987	1.24
1988	1.2994318182
1989	1.3588636364
1990	1.4182954545
1991	1.4777272727
1992	1.5371590909
1993	1.5965909091
1994	1.6560227273
1995	1.7154545455
1996	1.7748863636
1997	1.8343181818
1998	1.89375
1999	1.9531818182
2000	1.9682525253
2001	1.9833232323
2002	1.9983939394
2003	2.0134646465
2004	2.0285353535
2005	2.0436060606
2006	2.0586767677
2007	2.0737474747
2008	2.088
2009	2.088
2010	2.088
2011	2.088
2012	2.088
2013	2.088
2014	2.088
2015	2.088
2016	2.088
2017	2.088
2018	2.088
2019	2.088
2020	2.088