-96.86% is the change from 509 to 16
Calculation steps:
[( 16 - 509 ) ÷ 509] x 100 = -96.86%
Formula
Percentage change = [(16 - 509) / 509] x 100
Subtract the new number by the original number
16 - 509 = -493
-493 ÷ 509 = -0.9685658153241651
-0.9685658153241651 x 100 = -96.86%