| Year | Durbin-Watson (DW) | Temporal Autocorrelation Coefficient | P-value | Decision |
| 2013 | 1.927 | 0.0364 | 0.0512 | non-sig |
| 2014 | 1.843 | 0.0719 | 0.0002 | sig. |
| 2015 | 1.952 | 0.0238 | 0.1371 | non-sig |