Year	billion cubic meters
1992	5.4
1993	5.4
1994	5.4
1995	5.4
1996	5.4
1997	5.4
1998	5.4
1999	5.4
2000	5.4
2001	5.4
2002	5.4
2003	5.4
2004	5.4
2005	5.4
2006	5.4
2007	5.4
2008	5.4
2009	5.4
2010	5.4
2011	5.4
2012	5.4
2013	5.4
2014	5.4
2015	5.4
2016	5.4
2017	5.4
2018	5.4
2019	5.4
2020	5.4