Year	billion cubic meters
1996	1.555
1997	1.33925
1998	1.1235
1999	0.90775
2000	0.692
2001	0.6626
2002	0.6332
2003	0.8077333333
2004	0.9822666667
2005	1.1568
2006	0.854
2007	0.5512
2008	0.79915
2009	1.0471
2010	0.909
2011	0.7709
2012	0.6328
2013	0.4947
2014	0.6777413333
2015	0.8607826667
2016	1.043824
2017	1.598767
2018	2.15371
2019	1.59918
2020	1.59918