| Time | Forecast | Reality | Standard error |
| 2020 | 1.57 | 1.57 | 0.61 |
| 2021 | 2.01 | 1.68 | 0.61 |
| 2022 | 1.78 | 1.78 | 0.61 |
| 2023 | 1.70 | 1.62 | 0.61 |
| 2024 | 1.81 | 0.61 | |
| 2025 | 1.91 | 0.61 | |
| 2026 | 1.75 | 0.61 |