-35.41% is the change from 257 to 166
Calculation steps:
[( 166 - 257 ) ÷ 257] x 100 = -35.41%
Formula
Percentage change = [(166 - 257) / 257] x 100
Subtract the new number by the original number
166 - 257 = -91
-91 ÷ 257 = -0.3540856031128405
-0.3540856031128405 x 100 = -35.41%