-19.53% is the change from 256 to 206
Calculation steps:
[( 206 - 256 ) ÷ 256] x 100 = -19.53%
Formula
Percentage change = [(206 - 256) / 256] x 100
Subtract the new number by the original number
206 - 256 = -50
-50 ÷ 256 = -0.1953125
-0.1953125 x 100 = -19.53%