-30.86% is the change from 512 to 354
Calculation steps:
[( 354 - 512 ) ÷ 512] x 100 = -30.86%
Formula
Percentage change = [(354 - 512) / 512] x 100
Subtract the new number by the original number
354 - 512 = -158
-158 ÷ 512 = -0.30859375
-0.30859375 x 100 = -30.86%