Year	billion cubic meters
1986	42.2
1987	42.7786
1988	43.3572
1989	43.9358
1990	44.5117
1991	45.091
1992	44.515
1993	43.939
1994	43.363
1995	42.787
1996	42.211
1997	42.1297545455
1998	42.0485090909
1999	41.9672636364
2000	41.8860181818
2001	41.8047727273
2002	41.7235272727
2003	41.6422818182
2004	41.5610363636
2005	41.4797909091
2006	41.3985454545
2007	41.3173
2008	40.0573
2009	38.7973
2010	37.19865
2011	35.6
2012	36.44
2013	37.28
2014	36.505
2015	35.73
2016	35.9915
2017	36.253
2018	36.253
2019	36.253
2020	36.253