-51.06% is the change from 993 to 486
Calculation steps:
[( 486 - 993 ) ÷ 993] x 100 = -51.06%
Formula
Percentage change = [(486 - 993) / 993] x 100
Subtract the new number by the original number
486 - 993 = -507
-507 ÷ 993 = -0.5105740181268882
-0.5105740181268882 x 100 = -51.06%