-97.83% is the change from 690 to 15
Calculation steps:
[( 15 - 690 ) ÷ 690] x 100 = -97.83%
Formula
Percentage change = [(15 - 690) / 690] x 100
Subtract the new number by the original number
15 - 690 = -675
-675 ÷ 690 = -0.9782608695652174
-0.9782608695652174 x 100 = -97.83%