-70.69% is the change from 331 to 97
Calculation steps:
[( 97 - 331 ) ÷ 331] x 100 = -70.69%
Formula
Percentage change = [(97 - 331) / 331] x 100
Subtract the new number by the original number
97 - 331 = -234
-234 ÷ 331 = -0.7069486404833837
-0.7069486404833837 x 100 = -70.69%