-97.83% is the change from 691 to 15
Calculation steps:
[( 15 - 691 ) ÷ 691] x 100 = -97.83%
Formula
Percentage change = [(15 - 691) / 691] x 100
Subtract the new number by the original number
15 - 691 = -676
-676 ÷ 691 = -0.9782923299565847
-0.9782923299565847 x 100 = -97.83%