
We check for 1983 to 1986 if any bank had \( \geq 20% \) each year:
Bank A: \[ \text{1983: } \frac{23}{120} = 19.17%,\quad \text{Not qualified} \] Bank B: \[ \text{1984: } \frac{18}{140} = 12.85%,\quad \text{Not qualified} \] Bank C: \[ \text{1986: } \frac{11}{203} = 5.42%,\quad \text{Not qualified} \] Hence, none of the banks meet the criterion.




