-91.53% is the change from 177 to 15
Calculation steps:
[( 15 - 177 ) ÷ 177] x 100 = -91.53%
Formula
Percentage change = [(15 - 177) / 177] x 100
Subtract the new number by the original number
15 - 177 = -162
-162 ÷ 177 = -0.9152542372881356
-0.9152542372881356 x 100 = -91.53%