-86.68% is the change from 623 to 83
Calculation steps:
[( 83 - 623 ) ÷ 623] x 100 = -86.68%
Formula
Percentage change = [(83 - 623) / 623] x 100
Subtract the new number by the original number
83 - 623 = -540
-540 ÷ 623 = -0.8667736757624398
-0.8667736757624398 x 100 = -86.68%