|
|
|
2017 |
|
2016 |
|
2015 |
|
|
Dividend yield (%) |
|
— |
|
— |
|
— |
|
|
Expected volatility |
|
42.80 |
% |
44.80 |
% |
46.13 |
% |
|
Risk-free interest rate |
|
1.84 |
% |
1.39 |
% |
1.61 |
% |
|
Expected life of share options |
|
6 years |
|
6 years |
|
6 years |
|