-50.08% is the change from 623 to 311
Calculation steps:
[( 311 - 623 ) ÷ 623] x 100 = -50.08%
Formula
Percentage change = [(311 - 623) / 623] x 100
Subtract the new number by the original number
311 - 623 = -312
-312 ÷ 623 = -0.5008025682182986
-0.5008025682182986 x 100 = -50.08%