For the six months ended June 30, 2011 and June 30, 2010, estimated net pension expense for the defined benefit plans was as follows:
| Swiss plan | Non-Swiss plans | ||
in EUR | 2011 | 2010 | 2011 | 2010 |
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Components of pension expense |
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Service cost | 5 | 4 | 2 | 1 |
Interest cost | 2 | 1 | 2 | 2 |
Expected return on plan assets | (3) | (2) | (2) | (2) |
Pension expense, net | 4 | 3 | 2 | 1 |