Year	billion cubic meters
1992	26
1993	25.037
1994	24.072
1995	23.107
1996	22.142
1997	21.177
1998	20.212
1999	19.247
2000	18.28
2001	17.6422
2002	17.0024
2003	16.3626
2004	15.7228
2005	15.08
2006	15.0356
2007	14.988
2008	14.9408
2009	14.8934
2010	14.85
2011	13.86225
2012	12.8745
2013	11.88675
2014	10.899
2015	9.109
2016	9.325
2017	10.705
2018	10.705
2019	10.596
2020	9.459