-85.24% is the change from 210 to 31
Calculation steps:
[( 31 - 210 ) ÷ 210] x 100 = -85.24%
Formula
Percentage change = [(31 - 210) / 210] x 100
Subtract the new number by the original number
31 - 210 = -179
-179 ÷ 210 = -0.8523809523809524
-0.8523809523809524 x 100 = -85.24%