| Revenue | 31/12/2018 | 31/12/2017 | 31/12/2016 | 31/12/2015 |
| Total revenue | 1,255,975 | 1,146,394 | 988,240 | 828,283 |
| Cost of revenue | 1,188,142 | 1,085,487 | 933,128 | 780,541 |
| Gross profit | 67,833 | 60,907 | 55,112 | 47,742 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 53,214 | 46,584 | 45,496 | 40,007 |
| Non-recurring | - | - | - | - |
| Others | - | 476 | -830 | 1,103 |
| Total operating expenses | 1,241,356 | 1,132,071 | 977,794 | 821,651 |
| Operating income or loss | 14,619 | 14,323 | 10,446 | 6,632 |
| Income from continuing operations |
| Total other income/expenses net | -6,223 | -4,100 | -1,941 | -1,133 |
| Earnings before interest and taxes | 14,619 | 14,323 | 10,446 | 6,632 |
| Interest expense | -6,756 | -4,107 | -2,472 | -1,786 |
| Income before tax | 8,396 | 10,223 | 8,505 | 5,499 |
| Income tax expense | 293 | 2,125 | 1,452 | 1,144 |
| Minority interest | - | - | - | - |
| Net income from continuing ops | 8,103 | 8,098 | 7,053 | 4,355 |
| Non-recurring events |
| Discontinued operations | - | - | - | - |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 8,103 | 8,098 | 7,053 | 4,355 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 8,103 | 8,098 | 7,053 | 4,355 |