-53.9% is the change from 666 to 307
Calculation steps:
[( 307 - 666 ) ÷ 666] x 100 = -53.9%
Formula
Percentage change = [(307 - 666) / 666] x 100
Subtract the new number by the original number
307 - 666 = -359
-359 ÷ 666 = -0.539039039039039
-0.539039039039039 x 100 = -53.9%