| Revenue | 31/3/2019 | 31/3/2018 | 31/3/2017 | 31/3/2016 |
| Total revenue | 2,74,25,52,300 | 2,18,64,69,300 | 1,87,10,83,900 | 1,77,60,17,100 |
| Cost of revenue | 2,49,57,74,100 | 1,95,85,47,600 | 1,70,18,65,600 | 1,63,31,95,400 |
| Gross profit | 24,67,78,200 | 22,79,21,700 | 16,92,18,300 | 14,28,21,700 |
| Operating expenses |
| Research development | - | - | - | - |
| Selling general and administrative | 3,50,03,100 | 3,43,64,400 | 3,46,65,200 | 2,97,34,500 |
| Non-recurring | - | - | - | - |
| Others | 9,01,07,400 | 8,49,30,000 | 2,54,75,000 | 2,63,79,500 |
| Total operating expenses | 2,65,19,27,100 | 2,10,67,77,500 | 1,78,99,78,200 | 1,71,80,79,300 |
| Operating income or loss | 9,06,25,200 | 7,96,91,800 | 8,11,05,700 | 5,79,37,800 |
| Income from continuing operations |
| Total other income/expenses net | 97,66,800 | 2,14,09,600 | 3,08,68,500 | 94,13,200 |
| Earnings before interest and taxes | 9,06,25,200 | 7,96,91,800 | 8,11,05,700 | 5,79,37,800 |
| Interest expense | -59,89,400 | -52,85,100 | -51,67,800 | -55,38,400 |
| Income before tax | 10,03,92,000 | 10,11,01,400 | 11,19,74,200 | 6,73,51,000 |
| Income tax expense | 3,34,85,700 | 2,89,18,600 | 2,96,16,000 | 2,06,04,100 |
| Minority interest | - | - | - | - |
| Net income from continuing ops | 6,69,06,300 | 7,21,82,800 | 8,23,58,200 | 4,67,46,900 |
| Non-recurring events |
| Discontinued operations | - | - | - | - |
| Extraordinary items | - | - | - | - |
| Effect of accounting changes | - | - | - | - |
| Other items | - | - | - | - |
| Net income |
| Net income | 6,69,06,300 | 7,21,82,800 | 8,23,58,200 | 4,67,46,900 |
| Preferred stock and other adjustments | - | - | - | - |
| Net income applicable to common shares | 6,69,06,300 | 7,21,82,800 | 8,23,58,200 | 4,67,46,900 |