-97.35% is the change from 641 to 17
Calculation steps:
[( 17 - 641 ) ÷ 641] x 100 = -97.35%
Formula
Percentage change = [(17 - 641) / 641] x 100
Subtract the new number by the original number
17 - 641 = -624
-624 ÷ 641 = -0.9734789391575663
-0.9734789391575663 x 100 = -97.35%