Year	billion cubic meters
2001	2.427397619
2002	2.6067380952
2003	2.7860785714
2004	2.9654190476
2005	3.1447595238
2006	3.3241
2007	3.3241
2008	3.3241
2009	3.3241
2010	3.3241
2011	3.3241
2012	3.3241
2013	3.3241
2014	3.3241
2015	3.3241
2016	3.3241
2017	3.3241
2018	3.3241
2019	3.3241
2020	3.3241