| （単位：千ドル） | 営業利益 | 前年比（％） |
|---|---|---|
| 3Q18 | 46,954 | -20.7% |
| 2Q18 | 49,361 | -17.3% |
| 1Q18 | 53,377 | -7.6% |
| 4Q17 | 17,283 | -71.2% |
| 3Q17 | 59,205 | +0.8% |
| 2Q17 | 59,706 | -7.3% |
| 1Q17 | 57,789 | -9.0% |
| 4Q16 | 60,094 | -8.2% |
| 3Q16 | 58,732 | -8.3% |
| 2Q16 | 64,436 | -1.8% |
| 1Q16 | 63,534 | +4.0% |
| 4Q15 | 65,484 | +2.6% |
| 3Q15 | 64,021 | -5.1% |
| 2Q15 | 65,643 | -0.2% |
| 1Q15 | 61,067 | -6.3% |
| 4Q14 | 63,808 | -12.8% |
| 3Q14 | 67,467 | -0.6% |
| 2Q14 | 65,797 | +2.0% |
| 1Q14 | 65,173 | +12.7% |
| 4Q13 | 73,155 | +20.2% |
| 3Q13 | 67,879 | +33.8% |
| 2Q13 | 64,524 | +34.4% |
| 1Q13 | 57,807 | +33.8% |
| 4Q12 | 60,857 | +53.4% |
| 3Q12 | 50,731 | +15.0% |
| 2Q12 | 48,015 | -3.6% |
| 1Q12 | 43,195 | +4.1% |
| 4Q11 | 39,672 | - |
| 3Q11 | 44,117 | +17.9% |
| 2Q11 | 49,791 | - |
| 1Q11 | 41,474 | - |
| 3Q10 | 37,433 | - |