-48.79% is the change from 994 to 509
Calculation steps:
[( 509 - 994 ) ÷ 994] x 100 = -48.79%
Formula
Percentage change = [(509 - 994) / 994] x 100
Subtract the new number by the original number
509 - 994 = -485
-485 ÷ 994 = -0.4879275653923541
-0.4879275653923541 x 100 = -48.79%