-98.04% is the change from 663 to 13
Calculation steps:
[( 13 - 663 ) ÷ 663] x 100 = -98.04%
Formula
Percentage change = [(13 - 663) / 663] x 100
Subtract the new number by the original number
13 - 663 = -650
-650 ÷ 663 = -0.9803921568627451
-0.9803921568627451 x 100 = -98.04%