Year	billion cubic meters
1992	37.7
1993	37.7
1994	37.7
1995	37.7
1996	37.7
1997	37.7
1998	37.7
1999	37.7
2000	37.7
2001	37.7
2002	37.7
2003	37.7
2004	37.7
2005	37.7
2006	37.7
2007	37.7
2008	37.7
2009	37.7
2010	37.7
2011	37.7
2012	37.7
2013	37.7
2014	37.7
2015	37.7
2016	37.7
2017	37.7
2018	37.7
2019	37.7
2020	37.7