-53.15% is the change from 666 to 312
Calculation steps:
[( 312 - 666 ) ÷ 666] x 100 = -53.15%
Formula
Percentage change = [(312 - 666) / 666] x 100
Subtract the new number by the original number
312 - 666 = -354
-354 ÷ 666 = -0.5315315315315315
-0.5315315315315315 x 100 = -53.15%