-15.72% is the change from 509 to 429
Calculation steps:
[( 429 - 509 ) ÷ 509] x 100 = -15.72%
Formula
Percentage change = [(429 - 509) / 509] x 100
Subtract the new number by the original number
429 - 509 = -80
-80 ÷ 509 = -0.15717092337917485
-0.15717092337917485 x 100 = -15.72%