-98.79% is the change from 661 to 8
Calculation steps:
[( 8 - 661 ) ÷ 661] x 100 = -98.79%
Formula
Percentage change = [(8 - 661) / 661] x 100
Subtract the new number by the original number
8 - 661 = -653
-653 ÷ 661 = -0.9878971255673222
-0.9878971255673222 x 100 = -98.79%