| Dec'17 | Dec'16 | Dec'15 | Dec'14 | Dec'13 | Dec'12 | Dec'11 | Dec'10 | Dec'09 | Dec'08 |
|---|---|---|---|---|---|---|---|---|---|
Weighted-average number of shares | |||||||||
Basic (in shares) | |||||||||
753,600 | 776,000 | 800,700 | 819,900 | 843,100 | 871,100 | 902,200 | 466,300 | 469,200 | 474,700 |
Diluted (in shares) | |||||||||
757,300 | 779,200 | 805,100 | 823,500 | 846,100 | 875,400 | 908,900 | 470,100 | 473,500 | 480,000 |