Year	billion cubic meters
1992	2.63
1993	2.206
1994	1.782
1995	1.358
1996	1.3659142857
1997	1.3738285714
1998	1.3817428571
1999	1.3896571429
2000	1.3975714286
2001	1.4054857143
2002	1.4134
2003	1.4975
2004	1.5816
2005	1.6657
2006	1.7498
2007	1.8339
2008	1.604
2009	1.378
2010	1.842
2011	1.874
2012	1.631
2013	1.748
2014	1.72
2015	1.61534264
2016	1.7514
2017	1.7849
2018	1.60854
2019	1.00645
2020	0.8529523