4.3.34Independent Auditor’s Fees and Services

Fees included in other operating costs related to PwC, the 2019 and 2018 Company’s external independent auditor, are summarized as follows:

in thousands of US$

2019

2018

Audit of financial statements

2,204

2,209

Out of which:

- invoiced by PwC Accountants N.V.

1,488

1,133

- invoiced by PwC network firms

716

1,076

Tax advisory services by PwC network firms

59

79

Other assurance services

131

111

Total

2,394

2,399

In both 2019 and 2018, the other assurance services were mainly related to the review of the Company sustainability report.