Year	billion cubic meters
1999	0.01
2000	0.01
2001	0.01
2002	0.01
2003	0.01
2004	0.01
2005	0.01
2006	0.01
2007	0.01
2008	0.01
2009	0.01
2010	0.01
2011	0.01
2012	0.01
2013	0.01
2014	0.01
2015	0.01
2016	0.01
2017	0.01
2018	0.01
2019	0.01
2020	0.01