Year	billion cubic meters
2000	7.746
2001	8.249
2002	8.75125
2003	9.253875
2004	9.7565
2005	10.259125
2006	10.76175
2007	11.264375
2008	11.77
2009	13.7905434367
2010	15.8180868734
2011	17.8456303101
2012	19.8731737468
2013	21.9007171835
2014	23.9282606202
2015	25.9558040569
2016	27.9833474936
2017	27.5636340463
2018	27.1439206
2019	28.23487353
2020	29.11566976