-98.44% is the change from 836 to 13
Calculation steps:
[( 13 - 836 ) ÷ 836] x 100 = -98.44%
Formula
Percentage change = [(13 - 836) / 836] x 100
Subtract the new number by the original number
13 - 836 = -823
-823 ÷ 836 = -0.9844497607655502
-0.9844497607655502 x 100 = -98.44%