Year	billion cubic meters
1975	0.751
1976	0.7795263158
1977	0.8078421053
1978	0.8365789474
1979	0.8646842105
1980	0.8936315789
1981	0.9215263158
1982	0.9506842105
1983	0.9792105263
1984	1.0077368421
1985	1.0362631579
1986	1.0647894737
1987	1.0933157895
1988	1.1218421053
1989	1.1503684211
1990	1.1788947368
1991	1.2054210526
1992	1.2341578947
1993	1.2624736842
1994	1.291
1995	1.3143333333
1996	1.3376666667
1997	1.361
1998	1.3843333333
1999	1.4076666667
2000	1.266
2001	1.2414
2002	1.2168
2003	1.1922
2004	1.1676
2005	1.096
2006	1.1676
2007	1.2392
2008	1.3108
2009	1.3824
2010	1.454
2011	1.5256
2012	1.5972
2013	1.6688
2014	1.7404
2015	1.812
2016	1.812
2017	1.812
2018	1.812
2019	1.812
2020	1.812