-50% is the change from 918 to 459
Calculation steps:
[( 459 - 918 ) ÷ 918] x 100 = -50%
Formula
Percentage change = [(459 - 918) / 918] x 100
Subtract the new number by the original number
459 - 918 = -459
-459 ÷ 918 = -0.5
-0.5 x 100 = -50%
Example