-29% is the change from 231 to 164
Calculation steps:
[( 164 - 231 ) ÷ 231] x 100 = -29%
Formula
Percentage change = [(164 - 231) / 231] x 100
Subtract the new number by the original number
164 - 231 = -67
-67 ÷ 231 = -0.29004329004329005
-0.29004329004329005 x 100 = -29%