-18.78% is the change from 623 to 506
Calculation steps:
[( 506 - 623 ) ÷ 623] x 100 = -18.78%
Formula
Percentage change = [(506 - 623) / 623] x 100
Subtract the new number by the original number
506 - 623 = -117
-117 ÷ 623 = -0.18780096308186195
-0.18780096308186195 x 100 = -18.78%