| （単位：千ドル） | 営業利益 | 前年比（％） |
|---|---|---|
| 3Q18 | 23,356 | -14.0% |
| 2Q18 | 26,353 | -1.0% |
| 1Q18 | 26,059 | -3.9% |
| 3Q17 | 27,164 | +3.9% |
| 2Q17 | 26,612 | +0.5% |
| 1Q17 | 27,107 | +2.9% |
| 3Q16 | 26,136 | +9.6% |
| 2Q16 | 26,479 | +11.0% |
| 1Q16 | 26,336 | +8.1% |
| 3Q15 | 23,841 | -2.2% |
| 2Q15 | 23,856 | -0.6% |
| 1Q15 | 24,370 | -0.7% |
| 3Q14 | 24,380 | -0.2% |
| 2Q14 | 23,995 | +0.4% |
| 1Q14 | 24,530 | -1.6% |
| 3Q13 | 24,417 | +2.6% |
| 2Q13 | 23,891 | -25.2% |
| 1Q13 | 24,925 | -23.5% |
| 3Q12 | 23,795 | -27.7% |
| 2Q12 | 31,936 | - |
| 1Q12 | 32,577 | - |
| 3Q11 | 32,909 | - |