Change in Number of BCE2010 Outstanding
| Year ended December 31, | ||||||||||||
| Number of BCE2010 | 2015 | 2016 | 2017 | |||||||||
|
Balance at beginning of period |
29,972 | 15,974 | 12,339 | |||||||||
|
Granted during the period |
— | — | — | |||||||||
|
Forfeited during the period |
— | — | — | |||||||||
|
Exercised during the period |
13,998 | 3,635 | 1,334 | |||||||||
|
Expired during the period |
— | — | — | |||||||||
|
Balance at end of period |
15,974 | 12,339 | 11,005 | |||||||||