-49.92% is the change from 623 to 312
Calculation steps:
[( 312 - 623 ) ÷ 623] x 100 = -49.92%
Formula
Percentage change = [(312 - 623) / 623] x 100
Subtract the new number by the original number
312 - 623 = -311
-311 ÷ 623 = -0.49919743178170145
-0.49919743178170145 x 100 = -49.92%