-23.53% is the change from 816 to 624
Calculation steps:
[( 624 - 816 ) ÷ 816] x 100 = -23.53%
Formula
Percentage change = [(624 - 816) / 816] x 100
Subtract the new number by the original number
624 - 816 = -192
-192 ÷ 816 = -0.23529411764705882
-0.23529411764705882 x 100 = -23.53%