Year	billion cubic meters
1987	1.36
1988	1.3776884615
1989	1.3953769231
1990	1.4130653846
1991	1.4307538462
1992	1.4484423077
1993	1.4661307692
1994	1.4838192308
1995	1.5014884615
1996	1.5191961538
1997	1.5368846154
1998	1.5545730769
1999	1.5722615385
2000	1.58995
2001	1.90545
2002	2.22095
2003	2.2378604347
2004	2.2547708693
2005	2.271681304
2006	2.2885917387
2007	2.3055021733
2008	2.3232257444
2009	2.3402717018
2010	2.3573176592
2011	2.3743636166
2012	2.391409574
2013	2.4084555314
2014	2.4255014888
2015	2.4425474462
2016	2.4595934036
2017	2.47460652
2018	3.0258
2019	3.0616
2020	3.0616