| Revenue | 31/12/2018 | 31/12/2017 | 31/12/2016 | 31/12/2015 |
| Total revenue | 44,497,706 | 43,573,925 | 41,401,690 | 38,776,635 |
| Cost of revenue | 40,119,272 | 39,816,530 | 37,407,118 | 34,882,763 |
| Gross profit | 4,378,434 | 3,757,395 | 3,994,572 | 3,893,872 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 2,633,491 | 2,514,156 | 2,487,109 | 2,374,232 |
| Non-recurring | - | - | - | - |
| Others | -126,971 | 86,487 | -91,463 | -47,341 |
| Total operating expenses | 42,636,656 | 42,426,336 | 39,809,958 | 37,217,949 |
| Operating income or loss | 1,861,050 | 1,147,589 | 1,591,732 | 1,558,686 |
| Income from continuing operations |
| Total other income/expenses net | -243,659 | 414,937 | -291,779 | -179,344 |
| Earnings before interest and taxes | 1,861,050 | 1,147,589 | 1,591,732 | 1,558,686 |
| Interest expense | -851,213 | -531,900 | -371,942 | -466,836 |
| Income before tax | 1,617,391 | 1,562,526 | 1,299,953 | 1,379,342 |
| Income tax expense | 349,793 | 282,083 | 206,294 | 281,993 |
| Minority interest | 717,747 | 1,021,507 | 944,431 | 906,936 |
| Net income from continuing ops | 1,267,598 | 1,280,443 | 1,093,659 | 1,097,349 |
| Non-recurring events |
| Discontinued operations | -25,300 | -25,300 | -25,300 | -25,300 |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 1,128,002 | 1,195,668 | 972,245 | 1,022,925 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 1,128,002 | 1,195,668 | 972,245 | 1,022,925 |