| （単位：千ドル） | 営業利益 | 前年比（％） |
|---|---|---|
| 3Q18 | 37,352 | -4.1% |
| 2Q18 | 38,304 | +4.6% |
| 1Q18 | 35,891 | +1.3% |
| 4Q17 | 24,847 | -33.6% |
| 3Q17 | 38,939 | +237.9% |
| 2Q17 | 36,618 | -235.5% |
| 1Q17 | 35,433 | +16.3% |
| 4Q16 | 37,442 | +86.7% |
| 3Q16 | 11,525 | -64.0% |
| 2Q16 | -27,021 | -172.1% |
| 1Q16 | 30,464 | -0.4% |
| 4Q15 | 20,055 | -46.0% |
| 3Q15 | 31,993 | -14.5% |
| 2Q15 | 37,471 | +17.7% |
| 1Q15 | 30,575 | +21.3% |
| 4Q14 | 37,148 | +6.6% |
| 3Q14 | 37,422 | +75.5% |
| 2Q14 | 31,836 | -22.3% |
| 1Q14 | 25,206 | -29.3% |
| 4Q13 | 34,843 | +0.9% |
| 3Q13 | 21,323 | -349.3% |
| 2Q13 | 40,958 | +14.3% |
| 1Q13 | 35,657 | +15.5% |
| 4Q12 | 34,522 | -179.4% |
| 3Q12 | -8,552 | -126.8% |
| 2Q12 | 35,824 | -2300.5% |
| 1Q12 | 30,861 | +702.6% |
| 4Q11 | -43,482 | -223.9% |
| 3Q11 | 31,873 | +3.3% |
| 2Q11 | -1,628 | -104.8% |
| 1Q11 | 3,845 | - |
| 4Q10 | 35,088 | - |
| 3Q10 | 30,841 | - |
| 2Q10 | 33,976 | - |