-56.3% is the change from 913 to 399
Calculation steps:
[( 399 - 913 ) ÷ 913] x 100 = -56.3%
Formula
Percentage change = [(399 - 913) / 913] x 100
Subtract the new number by the original number
399 - 913 = -514
-514 ÷ 913 = -0.5629791894852135
-0.5629791894852135 x 100 = -56.3%