-56.15% is the change from 910 to 399
Calculation steps:
[( 399 - 910 ) ÷ 910] x 100 = -56.15%
Formula
Percentage change = [(399 - 910) / 910] x 100
Subtract the new number by the original number
399 - 910 = -511
-511 ÷ 910 = -0.5615384615384615
-0.5615384615384615 x 100 = -56.15%