-98.05% is the change from 771 to 15
Calculation steps:
[( 15 - 771 ) ÷ 771] x 100 = -98.05%
Formula
Percentage change = [(15 - 771) / 771] x 100
Subtract the new number by the original number
15 - 771 = -756
-756 ÷ 771 = -0.980544747081712
-0.980544747081712 x 100 = -98.05%