| Year | Value (billion cubic meters per year) |
|---|---|
|
2020 |
321.8 |
|
2019 |
321.79 |
|
2018 |
321.79 |
|
2017 |
321.77 |
|
2016 |
321.78 |
|
2015 |
321.77 |
|
2014 |
321.78 |
|
2013 |
321.78 |
|
2012 |
321.78 |
|
2011 |
321.56 |