-97.83% is the change from 645 to 14
Calculation steps:
[( 14 - 645 ) ÷ 645] x 100 = -97.83%
Formula
Percentage change = [(14 - 645) / 645] x 100
Subtract the new number by the original number
14 - 645 = -631
-631 ÷ 645 = -0.9782945736434109
-0.9782945736434109 x 100 = -97.83%