-98.45% is the change from 837 to 13
Calculation steps:
[( 13 - 837 ) ÷ 837] x 100 = -98.45%
Formula
Percentage change = [(13 - 837) / 837] x 100
Subtract the new number by the original number
13 - 837 = -824
-824 ÷ 837 = -0.984468339307049
-0.984468339307049 x 100 = -98.45%