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| Company | Unit | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
| Epwin Group | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 0.741 | 0.833 | 0.620 | 0.581 | 0.593 | ||||
| Eurocell | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 0.964 | 1.09 | 0.918 | |||
| Tyman | 1.35 | 1.34 | 1.20 | 1.21 | 1.20 |
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