Year	billion cubic meters
2006	78.89
2007	81.496
2008	82.489
2009	81.556
2010	83.273
2011	84.059
2012	84.248
2013	84.447
2014	84.432
2015	86.4
2016	87.11
2017	91.79128
2018	92.15781079
2019	85.86714704
2020	85.86714704