4. Staff costs
Staff costs of the Group were as follows:
|
2007/08
$m |
2006/07
$m |
2005/06
$m |
| Wages and salaries |
635.7 |
619.8 |
557.8 |
| Social security costs |
54.5 |
51.9 |
45.7 |
| Pension costs |
11.4 |
10.9 |
9.4 |
| Share-based payment expense |
0.4 |
6.7 |
8.1 |
| Total staff costs |
702.0 |
689.3 |
621.0 |