As part of the estimation of the retirement commitments, the following assumptions were used for all categories of employees:
| December 31, | ||||||||||||
| 2015 | 2016 | 2017 | ||||||||||
|
% social security contributions |
50.0 | % | 50.0 | % | 50.0 | % | ||||||
|
Salary increases |
2.0 | % | 2.0 | % | 2.0 | % | ||||||
|
Discount rate |
2.08 | % | 1.31 | % | 1.30 | % | ||||||