The data is based on antenatal screening of vaginal and rectal swabs received during the designated year.
| Year | No. tested | % |
|---|---|---|
| 2012 | 15,539 | 17.5 |
| 2013 | 13,520 | 16.9 |
| 2014 | 14,953 | 18.7 |
| 2015 | 15,177 | 17.8 |
| 2016 | 15,809 | 16.0 |
| 2017 | 13,725 | 19.4 |
| 2018 | 13,071 | 19.6 |
| 2019 | 12,335 | 21.2 |
| 2020 | 9,240 | 22.3 |
| 2021 | 7,781 | 22.5 |
| 2022 | 6,703 | 23.0 |
| 2023 | 6,837 | 22.5 |
| 2024 | 7,106 | 21.6 |
| 2025 (Jan to Jun) | 2,727 | 21.9 |