| （単位：千ドル） | 営業利益 | 前年比（％） |
|---|---|---|
| 4Q18 | 731,000 | +22.9% |
| 3Q18 | 803,000 | +27.7% |
| 2Q18 | 722,000 | +21.3% |
| 1Q18 | 530,000 | -2.9% |
| 4Q17 | 595,000 | +17.4% |
| 3Q17 | 629,000 | +63.8% |
| 2Q17 | 595,000 | +4.9% |
| 1Q17 | 546,000 | +16.2% |
| 4Q16 | 507,000 | +121.4% |
| 3Q16 | 384,000 | -31.1% |
| 2Q16 | 567,000 | -21.6% |
| 1Q16 | 470,000 | -14.2% |
| 4Q15 | 229,000 | -60.6% |
| 3Q15 | 557,000 | -15.5% |
| 2Q15 | 723,000 | +18.1% |
| 1Q15 | 548,000 | +6.8% |
| 4Q14 | 581,000 | +5.1% |
| 3Q14 | 659,000 | +25.8% |
| 2Q14 | 612,000 | +0.3% |
| 1Q14 | 513,000 | +23.9% |
| 4Q13 | 553,000 | +18.9% |
| 3Q13 | 524,000 | +6.3% |
| 2Q13 | 610,000 | -5.9% |
| 1Q13 | 414,000 | -36.1% |
| 4Q12 | 465,000 | -37.6% |
| 3Q12 | 493,000 | -22.8% |
| 2Q12 | 648,000 | -15.6% |
| 1Q12 | 648,000 | +22.5% |
| 4Q11 | 745,000 | +41.9% |
| 3Q11 | 639,000 | +46.9% |
| 2Q11 | 768,000 | +93.9% |
| 1Q11 | 529,000 | +115.0% |
| 4Q10 | 525,000 | - |
| 3Q10 | 435,000 | - |
| 2Q10 | 396,000 | - |
| 1Q10 | 246,000 | - |