-69.79% is the change from 331 to 100
Calculation steps:
[( 100 - 331 ) ÷ 331] x 100 = -69.79%
Formula
Percentage change = [(100 - 331) / 331] x 100
Subtract the new number by the original number
100 - 331 = -231
-231 ÷ 331 = -0.6978851963746223
-0.6978851963746223 x 100 = -69.79%