-56.25% is the change from 912 to 399
Calculation steps:
[( 399 - 912 ) ÷ 912] x 100 = -56.25%
Formula
Percentage change = [(399 - 912) / 912] x 100
Subtract the new number by the original number
399 - 912 = -513
-513 ÷ 912 = -0.5625
-0.5625 x 100 = -56.25%