Year	billion cubic meters
2008	13.56
2009	15.9420761799
2010	18.3191523599
2011	20.6962285398
2012	23.0733047198
2013	25.4503808997
2014	27.8274570796
2015	30.2045332596
2016	32.5816094395
2017	34.9586856195
2018	37.3357617994
2019	38.55
2020	38.55