-17.51% is the change from 257 to 212
Calculation steps:
[( 212 - 257 ) ÷ 257] x 100 = -17.51%
Formula
Percentage change = [(212 - 257) / 257] x 100
Subtract the new number by the original number
212 - 257 = -45
-45 ÷ 257 = -0.17509727626459143
-0.17509727626459143 x 100 = -17.51%