-23.72% is the change from 215 to 164
Calculation steps:
[( 164 - 215 ) ÷ 215] x 100 = -23.72%
Formula
Percentage change = [(164 - 215) / 215] x 100
Subtract the new number by the original number
164 - 215 = -51
-51 ÷ 215 = -0.2372093023255814
-0.2372093023255814 x 100 = -23.72%