4.3.34Independent Auditor’s Fees and Services

Fees included in other operating costs related to PwC, the 2020 and 2019 Company’s external independent auditor, are summarized as follows:

in thousands of US$

2020

2019

Audit of financial statements

2,526

2,204

Out of which:

- invoiced by PwC Accountants N.V.

1,522

1,488

- invoiced by PwC network firms

1,004

716

Tax advisory services by PwC network firms

50

59

Other assurance services

113

131

Total

2,689

2,394

In both 2020 and 2019, the other assurance services were mainly related to the review of the Company sustainability report.