Year	billion cubic meters
1988	0.5
1989	0.5284470588
1990	0.5568941176
1991	0.5853411765
1992	0.6137882353
1993	0.6422352941
1994	0.6706823529
1995	0.6991294118
1996	0.7275764706
1997	0.7560235294
1998	0.7844705882
1999	0.8129176471
2000	0.8413647059
2001	0.8698117647
2002	0.8982588235
2003	0.9267058824
2004	0.9551529412
2005	0.9836
2006	1.0422555556
2007	1.1009111111
2008	1.1595666667
2009	1.2182222222
2010	1.2768777778
2011	1.3355333333
2012	1.3941888889
2013	1.4528444444
2014	1.5115
2015	1.7215
2016	1.7472
2017	1.581289
2018	2.431511
2019	2.5833078
2020	2.5833078