-48.9% is the change from 996 to 509
Calculation steps:
[( 509 - 996 ) ÷ 996] x 100 = -48.9%
Formula
Percentage change = [(509 - 996) / 996] x 100
Subtract the new number by the original number
509 - 996 = -487
-487 ÷ 996 = -0.48895582329317266
-0.48895582329317266 x 100 = -48.9%