Year	billion cubic meters
1991	46.272
1992	49.9484873
1993	49.53953898
1994	49.19992302
1995	48.83088615
1996	47.76515568
1997	47.38274284
1998	45.80673577
1999	45.37060385
2000	44.88727848
2001	43.89921329
2002	42.7784437033
2003	41.6576741167
2004	40.53690453
2005	37.7762696867
2006	35.0156348433
2007	32.26
2008	32.5003333333
2009	32.7456666667
2010	32.99
2011	30.436
2012	27.8806666667
2013	25.326
2014	25.0316666667
2015	24.7373333333
2016	24.443
2017	24.443
2018	24.443
2019	24.443
2020	24.443