-31.04% is the change from 509 to 351
Calculation steps:
[( 351 - 509 ) ÷ 509] x 100 = -31.04%
Formula
Percentage change = [(351 - 509) / 509] x 100
Subtract the new number by the original number
351 - 509 = -158
-158 ÷ 509 = -0.3104125736738703
-0.3104125736738703 x 100 = -31.04%