-32.1% is the change from 623 to 423
Calculation steps:
[( 423 - 623 ) ÷ 623] x 100 = -32.1%
Formula
Percentage change = [(423 - 623) / 623] x 100
Subtract the new number by the original number
423 - 623 = -200
-200 ÷ 623 = -0.32102728731942215
-0.32102728731942215 x 100 = -32.1%