-82.87% is the change from 181 to 31
Calculation steps:
[( 31 - 181 ) ÷ 181] x 100 = -82.87%
Formula
Percentage change = [(31 - 181) / 181] x 100
Subtract the new number by the original number
31 - 181 = -150
-150 ÷ 181 = -0.8287292817679558
-0.8287292817679558 x 100 = -82.87%