-30.91% is the change from 508 to 351
Calculation steps:
[( 351 - 508 ) ÷ 508] x 100 = -30.91%
Formula
Percentage change = [(351 - 508) / 508] x 100
Subtract the new number by the original number
351 - 508 = -157
-157 ÷ 508 = -0.3090551181102362
-0.3090551181102362 x 100 = -30.91%