| Month | Forecast (%) | Observed value (%) | Forecast error |
| January | 11.32 | 10.9 | 0.42 |
| February | 10.43 | 9.6 | 0.83 |
| March | 9.66 | 9.0 | 0.66 |
| April | 10.08 | 9.4 | 0.66 |
| May | 7.90 | 7.2 | 0.70 |
| June | 8.74 | 7.9 | 0.84 |
| July | 7.29 | 6.3 | 0.99 |
| August | 7.48 | 6.6 | 0.88 |
| September | 5.03 | 4.5 | 0.53 |
| October | 4.81 | 3.9 | 0.91 |
| November | 5.14 | 4.3 | 0.84 |
| December | 6.30 | 5.6 | 0.70 |