-98.24% is the change from 853 to 15
Calculation steps:
[( 15 - 853 ) ÷ 853] x 100 = -98.24%
Formula
Percentage change = [(15 - 853) / 853] x 100
Subtract the new number by the original number
15 - 853 = -838
-838 ÷ 853 = -0.9824150058616647
-0.9824150058616647 x 100 = -98.24%