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LONG-TERM INCENTIVE PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
LONG-TERM INCENTIVE PLANS |
Summary of changes in restricted and performance shares |
Balance on January 1, 2015 |  | 10,086,234 |
Granted |  | 9,098,389 |
Forfeited |  | (2,717,724 | )
Exercised |  | (3,941,643 | )
Balance on December 31, 2015 |  | 12,525,256 |
Granted |  | 13,357,922 |
Forfeited |  | (3,046,593 | )
Exercised |  | (2,403,094 | )
Balance on December 31, 2016 |  | 20,433,491 |
Granted |  | 3,170,952 |
Forfeited |  | (1,901,782 | )
Exercised |  | (2,727,577 | )
Balance on December 31, 2017 |  | 18,975,084 |
Schedule of stock option activity |
|  | 2017 |  | 2016 |  | 2015 |
|  | Number of shares |  | Average exercise price in the year |  | Number of shares |  | Average exercise price in the year |  | Number of shares |  | Average exercise price in the year |
|  |  |  | R$ |  |  |  | R$ |  |  |  | R$ |
Available at beginning of the year |  | 569,115 |  | 16.64 |  | 1,074,246 |  | 18.36 |  | 2,448,973 |  | 19.53 |
Options Exercised |  | — |  | — |  | — |  | — |  | (25,210 | ) | 19.56 |
Options Forfeited |  | (276,724 | ) | 15.11 |  | (505,131 | ) | 20.49 |  | (1,349,517 | ) | 20.98 |
Available at the end of the year |  | 292,391 |  | 17.91 |  | 569,115 |  | 16.64 |  | 1,074,246 |  | 18.36 |
Summary of stock options by exercise price |
Exercise price |  | Quantity |  | Average period of grace (in years) |  | Average exercise price |  | Number exercisable at December 31, 2017* |
|  |  |  |  |  | R$ |  |  |
R$ 14.39 |  | 40,873 |  | 1.2 |  | 13.89 |  | 40,873 |
R$ 10.58 to R$ 29.12 |  | 251,518 |  | 5.0 |  | 18.56 |  | 16,795 |
|  | 292,391 |  |  |  |  |  | 57,668 |
*The total of options vested that are exercisable on December 31, 2017 is 57,668 (57,678 and 127,899 on December 31, 2016 and 2015).

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