% Replacement | % Increase in Cost (∆C) | % Increase in Stability (∆S) | Increase Ratio ∆S/∆C |
HW5 | 53 | 13 | 0.24 |
HW10 | 109 | 33 | 0.31 |
HW15 | 163 | 105 | 0.65 |
HW20 | 219 | 205 | 0.94 |
HW25 | 273 | 57 | 0.21 |