Cases | 2015 | 2016 | 2017 | Total |
| n (%) | n (%) | n (%) | n (%) |
All cases | 2065 | 3240 | 3358 | 8663 |
New | 2049 (99) | 3184 (98) | 3307 (98.4) | 8540 |
Retreatment cases | 16 (1) | 56 (1.7) | 51 (1.6) | 123 |