-81.45% is the change from 663 to 123
Calculation steps:
[( 123 - 663 ) ÷ 663] x 100 = -81.45%
Formula
Percentage change = [(123 - 663) / 663] x 100
Subtract the new number by the original number
123 - 663 = -540
-540 ÷ 663 = -0.8144796380090498
-0.8144796380090498 x 100 = -81.45%