Buy annual subscriptions for all our products.
| Company | Unit | Dec 2011 | Mar 2012 | Jun 2012 | Sep 2012 | Dec 2012 | Mar 2013 | Jun 2013 | Sep 2013 | Dec 2013 | Mar 2014 | Jun 2014 | Sep 2014 | 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 | MW | 91.8 | 92.0 | 92.3 | 92.5 | 92.8 |
Helgi Library 
