Year	billion cubic meters
1990	20.57
1991	21.2657142857
1992	21.9614285714
1993	22.6571428571
1994	23.3528571429
1995	24.0485714286
1996	24.7442857143
1997	25.44
1998	26.1856
1999	26.9312
2000	27.6768
2001	28.4224
2002	29.168
2003	29.1776666667
2004	29.1873333333
2005	29.197
2006	29.197
2007	29.197
2008	29.197
2009	29.197
2010	29.197
2011	29.197
2012	29.197
2013	29.197
2014	29.197
2015	29.197
2016	29.197
2017	29.197
2018	29.197
2019	29.197
2020	29.197