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Company | Unit | Dec 2014 | Mar 2015 | Jun 2015 | Sep 2015 | Dec 2015 | Mar 2016 | Jun 2016 | Sep 2016 | Dec 2016 | Mar 2017 | Jun 2017 | Sep 2017 | Dec 2017 | Mar 2018 | Jun 2018 | Sep 2018 | Dec 2018 |
CEZ | % | 4.77 | 4.54 | 4.31 | 4.39 | 4.46 |