-50.24% is the change from 623 to 310
Calculation steps:
[( 310 - 623 ) ÷ 623] x 100 = -50.24%
Formula
Percentage change = [(310 - 623) / 623] x 100
Subtract the new number by the original number
310 - 623 = -313
-313 ÷ 623 = -0.5024077046548957
-0.5024077046548957 x 100 = -50.24%