Year	billion cubic meters
1975	153.368
1976	153.5075
1977	153.647
1978	153.7865
1979	153.926
1980	154.0655
1981	154.205
1982	154.3445
1983	154.484
1984	154.6235
1985	154.763
1986	154.9025
1987	155.042
1988	155.1815
1989	155.321
1990	155.4605
1991	155.6
1992	157.4844444444
1993	159.3688888889
1994	161.2533333333
1995	163.1377777778
1996	165.0222222222
1997	166.9066666667
1998	168.7911111111
1999	170.6755555556
2000	172.56
2001	173.83575
2002	175.1115
2003	176.38725
2004	177.663
2005	178.93875
2006	180.4425
2007	181.94625
2008	183.5
2009	183.09
2010	185.28
2011	179.48
2012	187.88
2013	183.5
2014	194.87
2015	196.9
2016	199.77
2017	199.97
2018	192.74
2019	177.11
2020	189.59