-86.3% is the change from 993 to 136
Calculation steps:
[( 136 - 993 ) ÷ 993] x 100 = -86.3%
Formula
Percentage change = [(136 - 993) / 993] x 100
Subtract the new number by the original number
136 - 993 = -857
-857 ÷ 993 = -0.8630412890231621
-0.8630412890231621 x 100 = -86.3%