-98.25% is the change from 859 to 15
Calculation steps:
[( 15 - 859 ) ÷ 859] x 100 = -98.25%
Formula
Percentage change = [(15 - 859) / 859] x 100
Subtract the new number by the original number
15 - 859 = -844
-844 ÷ 859 = -0.9825378346915018
-0.9825378346915018 x 100 = -98.25%