-72.29% is the change from 231 to 64
Calculation steps:
[( 64 - 231 ) ÷ 231] x 100 = -72.29%
Formula
Percentage change = [(64 - 231) / 231] x 100
Subtract the new number by the original number
64 - 231 = -167
-167 ÷ 231 = -0.7229437229437229
-0.7229437229437229 x 100 = -72.29%