-40.69% is the change from 666 to 395
Calculation steps:
[( 395 - 666 ) ÷ 666] x 100 = -40.69%
Formula
Percentage change = [(395 - 666) / 666] x 100
Subtract the new number by the original number
395 - 666 = -271
-271 ÷ 666 = -0.4069069069069069
-0.4069069069069069 x 100 = -40.69%