-86.05% is the change from 638 to 89
Calculation steps:
[( 89 - 638 ) ÷ 638] x 100 = -86.05%
Formula
Percentage change = [(89 - 638) / 638] x 100
Subtract the new number by the original number
89 - 638 = -549
-549 ÷ 638 = -0.8605015673981191
-0.8605015673981191 x 100 = -86.05%