-94.3% is the change from 509 to 29
Calculation steps:
[( 29 - 509 ) ÷ 509] x 100 = -94.3%
Formula
Percentage change = [(29 - 509) / 509] x 100
Subtract the new number by the original number
29 - 509 = -480
-480 ÷ 509 = -0.9430255402750491
-0.9430255402750491 x 100 = -94.3%