| Taxa Group | Trend | Equation | r2 |
| AGAR | Linear | −0.1016x + 0.6585 | 0.9962 |
| PAST | Linear | −0.1151x + 0.6112 | 0.9939 |
| PFUR | Polynomial | −0.0433x3 + 0.348x2 ? 0.9175x + 1.0392 | 1.0000 |
| SRAD | Polynomial | −0.0172x3 + 0.1777x2 ? 0.6474x + 0.9013 | 1.0000 |
| SSID | Polynomial | −0.0461x3 + 0.4501x2 ? 1.3889x + 1.4848 | 1.0000 |
| ALL | Polynomial | 0.0223x2 ? 0.2192x + 0.6165 | 1.0000 |