Year	billion cubic meters
1992	16.12
1993	16.569525
1994	17.00505
1995	17.472575
1996	17.9091
1997	18.368625
1998	18.81315
1999	19.237675
2000	19.6742
2001	19.9834625
2002	20.346725
2003	20.5959875
2004	20.88325
2005	21.4756875
2006	22.64
2007	22.4670833333
2008	22.2941666667
2009	22.12125
2010	21.9483333333
2011	21.7754166667
2012	21.6025
2013	21.46175
2014	21.473
2015	22.773
2016	22.31
2017	22.943
2018	23.38
2019	23.38
2020	23.38