-74.32% is the change from 993 to 255
Calculation steps:
[( 255 - 993 ) ÷ 993] x 100 = -74.32%
Formula
Percentage change = [(255 - 993) / 993] x 100
Subtract the new number by the original number
255 - 993 = -738
-738 ÷ 993 = -0.743202416918429
-0.743202416918429 x 100 = -74.32%