-98.22% is the change from 843 to 15
Calculation steps:
[( 15 - 843 ) ÷ 843] x 100 = -98.22%
Formula
Percentage change = [(15 - 843) / 843] x 100
Subtract the new number by the original number
15 - 843 = -828
-828 ÷ 843 = -0.9822064056939501
-0.9822064056939501 x 100 = -98.22%