-16.8% is the change from 256 to 213
Calculation steps:
[( 213 - 256 ) ÷ 256] x 100 = -16.8%
Formula
Percentage change = [(213 - 256) / 256] x 100
Subtract the new number by the original number
213 - 256 = -43
-43 ÷ 256 = -0.16796875
-0.16796875 x 100 = -16.8%