-82.08% is the change from 173 to 31
Calculation steps:
[( 31 - 173 ) ÷ 173] x 100 = -82.08%
Formula
Percentage change = [(31 - 173) / 173] x 100
Subtract the new number by the original number
31 - 173 = -142
-142 ÷ 173 = -0.8208092485549133
-0.8208092485549133 x 100 = -82.08%