-74.27% is the change from 999 to 257
Calculation steps:
[( 257 - 999 ) ÷ 999] x 100 = -74.27%
Formula
Percentage change = [(257 - 999) / 999] x 100
Subtract the new number by the original number
257 - 999 = -742
-742 ÷ 999 = -0.7427427427427428
-0.7427427427427428 x 100 = -74.27%