-56.54% is the change from 918 to 399
Calculation steps:
[( 399 - 918 ) ÷ 918] x 100 = -56.54%
Formula
Percentage change = [(399 - 918) / 918] x 100
Subtract the new number by the original number
399 - 918 = -519
-519 ÷ 918 = -0.565359477124183
-0.565359477124183 x 100 = -56.54%