Year	billion cubic meters
2006	3.87265
2007	3.9578
2008	4.691
2009	4.634
2010	4.419
2011	4.75
2012	4.403
2013	4.709
2014	3.935
2015	4.689
2016	4.707
2017	5.377
2018	5.5575
2019	5.6186
2020	5.3245