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Historical Values
Year Value
2008 20 cu km (1987)
2009 20 cu km (1987)
2010 20 cu km (1987)
2011 20 cu km (1987)
2012 20 cu km (1987)
2013 20 cu km (2011)
2014 20 cu km (2011)
2015 20 cu km (2011)
2021 20 billion cubic meters (2017 est.)
2022 20 billion cubic meters (2017 est.)
2023 20 billion cubic meters (2020 est.)
2024 20 billion cubic meters (2020 est.)
2025 20 billion cubic meters (2022 est.)