| Movements of contracted concessional assets |
| a) | The following table shows the movements of contracted concessional assets included in the heading “Contracted Concessional assets” for 2017: |
Cost | | | | | | | | | Total as of January 1, 2017 | | | 10,067,596 | | Additions | | | 15,426 | | Subtractions | | | (42,500 | ) | Translation differences | | | 593,247 | | Total as of December 31, 2017 | | | 10,633,769 | |
Accumulated amortization | | | | | | | | | Total as of January 1, 2017 | | | (1,143,324 | ) | Additions | | | (309,846 | ) | Translation differences | | | (96,329 | ) | Total accum. amort. as of December 31, 2017 | | | (1,549,499 | ) | Net balance at December 31, 2017 | | | 9,084,270 | |
| b) | The following table shows the movements of contracted concessional assets included in the heading “Contracted Concessional assets” for 2016: |
Cost | | | | | | | | | Total as of January 1, 2016 | | | 10,126,023 | | Additions | | | 6,346 | | Translation differences | | | (68,199 | ) | Change in the scope of the consolidated financial statements | | | 5,876 | | Reclassification and other movements | | | (2,450 | ) | | | | | | | Total as of December 31, 2016 | | | 10,067,596 | |
Accumulated amortization | | | | | | | | | Total as of January 1, 2016 | | | (825,126 | ) | Additions | | | (332,925 | ) | Change in the scope of the consolidated financial statements | | | (2,381 | ) | Translation differences | | | 17,108 | | Total accum. amort. as of December 31, 2016 | | | (1,143,324 | ) | Net balance at December 31, 2016 | | | 8,924,272 | |
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