DEZA`s Effective Tax Rate reached 9.98 % in 2015. This is 17.7 % less than in the previous year.
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| Company | Unit | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| DEZA | % | ... | 2.99 | 11.8 | 17.1 | 14.9 | 12.2 | |||||||||||
| Explosia | % | ... | ... | ... | ... | -0.536 | -2.88 | 1.33 | 6.58 | 21.8 | ||||||||
| LARS Chemie | % | ... | ... | ... | ... | ... | ... | ... | ... | 23.8 | 20.3 | 21.8 | 20.0 | 14.7 | ... | |||
| Lovochemie | % | 20.8 | 10.2 | 19.5 | 18.2 | 19.1 | ||||||||||||
| Precheza | % | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 2.18 | -9.83 | 14.4 | 11.1 | 16.4 | ... | |
| SPOLANA | % | ... | ... | ... | ... | 0 | 0 | 0 | 0 | 0 | ... | |||||||
| Spolchemie | % | ... | ... | ... | ... | ... | ... | ... | ... | 3.69 | 38.2 | 36.3 | 5.00 | 8.69 | ... | |||
| Synthos Kralupy | % | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 19.9 | 18.0 | 16.0 | 19.3 | 20.4 | ... |
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