-95.48% is the change from 509 to 23
Calculation steps:
[( 23 - 509 ) ÷ 509] x 100 = -95.48%
Formula
Percentage change = [(23 - 509) / 509] x 100
Subtract the new number by the original number
23 - 509 = -486
-486 ÷ 509 = -0.9548133595284872
-0.9548133595284872 x 100 = -95.48%