PKN`s Cost Per Employee reached 2,371 USD per month in 2015. This is 4.79 % less than in the previous year.
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| Company | Unit | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| Grupa Lotos | USD per month | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 3,550 | ||
| PGNiG | USD per month | ... | ... | ... | ... | 2,091 | 2,255 | 2,444 | 2,441 | 2,715 | ||||
| PKN | USD per month | 2,378 | 2,495 | 2,611 | 2,512 | 2,632 |
Helgi Library 
