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20. SHAREHOLDERS' EQUITY (Details) - shares | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Number of common shares outstanding | 1,387,524,047 | 1,387,524,047
Percent of total shares | 100.00% | 100.00%
USIM3 |  |
Number of common shares outstanding | 1,380,114,547 |
Percent of total shares | 99.47% |
Percent of voting capital | 100.00% |
Treasury shares |  |
Number of common shares outstanding | 7,409,500 | 30,391,000
Percent of total shares | 0.53% | 2.19%
Common |  |
Number of common shares outstanding |  | 1,357,133,047
Percent of total shares |  | 97.81%
Percent of voting capital |  | 100.00%
Vicunha Acos S.A. |  |
Number of common shares outstanding | 679,522,254 | 682,855,454
Percent of total shares | 48.97% | 49.21%
Percent of voting capital | 49.24% | 50.32%
Rio Iaco Participacoes S.A. |  |
Number of common shares outstanding | 58,193,503 | 58,193,503
Percent of total shares | 4.19% | 4.19%
Percent of voting capital | 4.22% | 4.29%
NYSE (ADRs) |  |
Number of common shares outstanding | 284,152,319 | 303,590,364
Percent of total shares | 20.48% | 21.88%
Percent of voting capital | 20.59% | 22.37%
Other |  |
Number of common shares outstanding | 358,246,471 | 312,493,726
Percent of total shares | 25.82% | 22.52%
Percent of voting capital | 25.95% | 23.02%

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