-49.55% is the change from 993 to 501
Calculation steps:
[( 501 - 993 ) ÷ 993] x 100 = -49.55%
Formula
Percentage change = [(501 - 993) / 993] x 100
Subtract the new number by the original number
501 - 993 = -492
-492 ÷ 993 = -0.4954682779456193
-0.4954682779456193 x 100 = -49.55%