-98.49% is the change from 664 to 10
Calculation steps:
[( 10 - 664 ) ÷ 664] x 100 = -98.49%
Formula
Percentage change = [(10 - 664) / 664] x 100
Subtract the new number by the original number
10 - 664 = -654
-654 ÷ 664 = -0.9849397590361446
-0.9849397590361446 x 100 = -98.49%