-91.24% is the change from 993 to 87
Calculation steps:
[( 87 - 993 ) ÷ 993] x 100 = -91.24%
Formula
Percentage change = [(87 - 993) / 993] x 100
Subtract the new number by the original number
87 - 993 = -906
-906 ÷ 993 = -0.9123867069486404
-0.9123867069486404 x 100 = -91.24%