DEZA`s Sales of Heat reached 87.4 CZK mil in 2015. This is 2.44 % more than in the previous year.
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| Company | Unit | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| DEZA | CZK mil | 93.0 | 104 | 97.0 | 102 | 98.6 |
Helgi Library 
