-82.5% is the change from 623 to 109
Calculation steps:
[( 109 - 623 ) ÷ 623] x 100 = -82.5%
Formula
Percentage change = [(109 - 623) / 623] x 100
Subtract the new number by the original number
109 - 623 = -514
-514 ÷ 623 = -0.8250401284109149
-0.8250401284109149 x 100 = -82.5%