-3.76% is the change from 266 to 256
Calculation steps:
[( 256 - 266 ) ÷ 266] x 100 = -3.76%
Formula
Percentage change = [(256 - 266) / 266] x 100
Subtract the new number by the original number
256 - 266 = -10
-10 ÷ 266 = -0.03759398496240601
-0.03759398496240601 x 100 = -3.76%