-43.89% is the change from 909 to 510
Calculation steps:
[( 510 - 909 ) ÷ 909] x 100 = -43.89%
Formula
Percentage change = [(510 - 909) / 909] x 100
Subtract the new number by the original number
510 - 909 = -399
-399 ÷ 909 = -0.4389438943894389
-0.4389438943894389 x 100 = -43.89%