| Year | Season Best | Age | vs Prior Year | % Change | |
|---|---|---|---|---|---|
| 2026 | 3:58.96 | 34.9 | -2.63 | -1.11% | |
| 2025 | 3:56.33 | 34.2 | +0.07 | +0.03% | PB |
| 2024 | 3:56.40 | 33.0 | +0.52 | +0.22% | PB |
| 2023 | 3:56.92 | 32.2 | +3.66 | +1.52% | PB |
| 2022 | 4:00.58 | 31.0 | -1.57 | -0.66% | |
| 2021 | 3:59.01 | 30.1 | +5.21 | +2.13% | PB |
| 2019 | 4:04.22 | 28.2 | -3.36 | -1.40% | |
| 2018 | 4:00.86 | 26.9 | +3.51 | +1.44% | PB |
| 2017 | 4:04.37 | 26.0 | -2.59 | -1.07% | |
| 2016 | 4:01.78 | 24.9 | +nan | +nan% | PB |