-83.42% is the change from 187 to 31
Calculation steps:
[( 31 - 187 ) ÷ 187] x 100 = -83.42%
Formula
Percentage change = [(31 - 187) / 187] x 100
Subtract the new number by the original number
31 - 187 = -156
-156 ÷ 187 = -0.8342245989304813
-0.8342245989304813 x 100 = -83.42%