-69.61% is the change from 102 to 31
Calculation steps:
[( 31 - 102 ) ÷ 102] x 100 = -69.61%
Formula
Percentage change = [(31 - 102) / 102] x 100
Subtract the new number by the original number
31 - 102 = -71
-71 ÷ 102 = -0.696078431372549
-0.696078431372549 x 100 = -69.61%