-54.18% is the change from 993 to 455
Calculation steps:
[( 455 - 993 ) ÷ 993] x 100 = -54.18%
Formula
Percentage change = [(455 - 993) / 993] x 100
Subtract the new number by the original number
455 - 993 = -538
-538 ÷ 993 = -0.5417925478348439
-0.5417925478348439 x 100 = -54.18%