-67.98% is the change from 509 to 163
Calculation steps:
[( 163 - 509 ) ÷ 509] x 100 = -67.98%
Formula
Percentage change = [(163 - 509) / 509] x 100
Subtract the new number by the original number
163 - 509 = -346
-346 ÷ 509 = -0.6797642436149313
-0.6797642436149313 x 100 = -67.98%