-58.26% is the change from 666 to 278
Calculation steps:
[( 278 - 666 ) ÷ 666] x 100 = -58.26%
Formula
Percentage change = [(278 - 666) / 666] x 100
Subtract the new number by the original number
278 - 666 = -388
-388 ÷ 666 = -0.5825825825825826
-0.5825825825825826 x 100 = -58.26%