| Revenue | 31/12/2018 | 31/12/2017 | 31/12/2016 | 31/12/2015 |
| Total revenue | 18,991,800 | 17,336,700 | 15,764,000 | 15,718,300 |
| Cost of revenue | 15,086,900 | 13,926,400 | 12,800,500 | 12,786,600 |
| Gross profit | 3,904,900 | 3,410,300 | 2,963,500 | 2,931,700 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 1,945,600 | 1,884,400 | 1,623,800 | 1,634,500 |
| Non-recurring | - | - | - | - |
| Others | 239,400 | -368,100 | -160,000 | 122,600 |
| Total operating expenses | 17,271,900 | 15,442,700 | 14,264,300 | 14,543,700 |
| Operating income or loss | 1,719,900 | 1,894,000 | 1,499,700 | 1,174,600 |
| Income from continuing operations |
| Total other income/expenses net | 454,900 | 502,500 | 340,800 | 450,100 |
| Earnings before interest and taxes | 1,719,900 | 1,894,000 | 1,499,700 | 1,174,600 |
| Interest expense | -180,300 | -85,300 | -66,700 | -61,400 |
| Income before tax | 2,174,800 | 2,396,500 | 1,840,500 | 1,624,700 |
| Income tax expense | 595,200 | 487,400 | 343,000 | 338,200 |
| Minority interest | 7,345,400 | 6,989,700 | 6,321,800 | 5,560,900 |
| Net income from continuing ops | 1,579,600 | 1,909,100 | 1,497,500 | 1,286,500 |
| Non-recurring events |
| Discontinued operations | - | - | - | - |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 419,600 | 938,800 | 701,700 | 690,800 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 419,600 | 938,800 | 701,700 | 690,800 |