-50.96% is the change from 993 to 487
Calculation steps:
[( 487 - 993 ) ÷ 993] x 100 = -50.96%
Formula
Percentage change = [(487 - 993) / 993] x 100
Subtract the new number by the original number
487 - 993 = -506
-506 ÷ 993 = -0.5095669687814703
-0.5095669687814703 x 100 = -50.96%