-31.63% is the change from 509 to 348
Calculation steps:
[( 348 - 509 ) ÷ 509] x 100 = -31.63%
Formula
Percentage change = [(348 - 509) / 509] x 100
Subtract the new number by the original number
348 - 509 = -161
-161 ÷ 509 = -0.3163064833005894
-0.3163064833005894 x 100 = -31.63%