-51.41% is the change from 177 to 86
Calculation steps:
[( 86 - 177 ) ÷ 177] x 100 = -51.41%
Formula
Percentage change = [(86 - 177) / 177] x 100
Subtract the new number by the original number
86 - 177 = -91
-91 ÷ 177 = -0.5141242937853108
-0.5141242937853108 x 100 = -51.41%