-84.62% is the change from 663 to 102
Calculation steps:
[( 102 - 663 ) ÷ 663] x 100 = -84.62%
Formula
Percentage change = [(102 - 663) / 663] x 100
Subtract the new number by the original number
102 - 663 = -561
-561 ÷ 663 = -0.8461538461538461
-0.8461538461538461 x 100 = -84.62%