26 Depreciation, amortization and impairment losses The following table provides a breakdown of depreciation, amortization and impairment losses: (XLS:) Download millions of € 2018 2017 2016 AMORTIZATION AND IMPAIRMENT OF INTANGIBLE ASSETS 5,021 6,193 4,602 Of which: Goodwill impairment losses 639 2,071 471 Amortization of mobile licenses 1,049 1,038 949 Impairment losses on mobile licenses 19 4 0 DEPRECIATION AND IMPAIRMENT OF PROPERTY, PLANT AND EQUIPMENT 8,814 8,393 8,778 Of which: Impairment losses recognized on property, plant and equipment 38 81 221 13,836 14,586 13,380 Impairment losses break down as follows: (XLS:) Download millions of € 2018 2017 2016 INTANGIBLE ASSETS 685 2,077 472 Of which: Goodwill from the year-end impairment test 639 829 471 Goodwill in connection with ad hoc impairment testing in the Systems Solutions operating segment 0 1,242 0 FCC licenses 0 4 0 PROPERTY, PLANT AND EQUIPMENT 38 81 221 Of which: from the year-end impairment test 0 37 128 722 2,158 693 Depreciation, amortization and impairment losses decreased by EUR 0.8 billion year-on-year. This decline is due in particular to the impairment losses recognized in 2017 on goodwill in the Systems Solutions operating segment of EUR 1.2 billion and in the Europe operating segment in the national companies in Poland, Romania, and Albania of EUR 0.8 billion in total. Impairment losses recognized in 2018 on goodwill in the Europe operating segment in the national companies in Poland and Romania amounted to EUR 0.6 billion in total. Impairment losses amounting to EUR 35 million were recognized on property, plant and equipment and intangible assets in the reporting year in connection with the sale of the shares in Telekom Albania agreed in January 2019. Depreciation and amortization was EUR 0.7 billion higher than in the prior-year period. This was attributable in particular to the United States and Germany operating segments and the Group Headquarters & Group Services segment. For further information, please refer to Note 6 “Intangible assets”, and Note 7 “Property, plant and equipment”.