-68.35% is the change from 812 to 257
Calculation steps:
[( 257 - 812 ) ÷ 812] x 100 = -68.35%
Formula
Percentage change = [(257 - 812) / 812] x 100
Subtract the new number by the original number
257 - 812 = -555
-555 ÷ 812 = -0.6834975369458128
-0.6834975369458128 x 100 = -68.35%