The table below shows the number of laboratory-confirmed, locally acquired cases of Dengue fever in a Southern European country in 2012 and 2022.
| Year | Number of confirmed Dengue fever cases |
|---|---|
| 2012 | 12 |
| 2022 | 85 |
Explain why there has been an increase in the number of locally acquired cases of Dengue fever in humans in this region.
