-22.79% is the change from 215 to 166
Calculation steps:
[( 166 - 215 ) ÷ 215] x 100 = -22.79%
Formula
Percentage change = [(166 - 215) / 215] x 100
Subtract the new number by the original number
166 - 215 = -49
-49 ÷ 215 = -0.22790697674418606
-0.22790697674418606 x 100 = -22.79%