| Year | Case | Incidence (1/10 w) |
| 2013 | 1905 | 6.47 |
| 2014 | 2041 | 6.87 |
| 2015 | 2384 | 7.97 |
| 2016 | 3120 | 10.33 |
| 2017 | 5419 | 17.78 |
| 2018 | 15,160 | 49.30 |
| 2019 | 65,268 | 210.78 |
| 2020 | 20,988 | 67.78 |
| Average | 14536 | 47.16 |