-87.33% is the change from 663 to 84
Calculation steps:
[( 84 - 663 ) ÷ 663] x 100 = -87.33%
Formula
Percentage change = [(84 - 663) / 663] x 100
Subtract the new number by the original number
84 - 663 = -579
-579 ÷ 663 = -0.8733031674208145
-0.8733031674208145 x 100 = -87.33%