-49.44% is the change from 623 to 315
Calculation steps:
[( 315 - 623 ) ÷ 623] x 100 = -49.44%
Formula
Percentage change = [(315 - 623) / 623] x 100
Subtract the new number by the original number
315 - 623 = -308
-308 ÷ 623 = -0.4943820224719101
-0.4943820224719101 x 100 = -49.44%