| #Purchase | renewal | dropout | Year | |||
| 2014 | 2015 | 2016 | Total | |||
| 1 | 0 | 1 | 813 | 993 | 0 | 1806 |
| 2 | 1 | 1 | 681 | 1112 | 591 | 2384 |
| 3 | 2 | 0 | 700 | 700 | 700 | 2100 |
| Total | 2194 | 2805 | 1291 | 6290 | ||