-30.53% is the change from 511 to 355
Calculation steps:
[( 355 - 511 ) ÷ 511] x 100 = -30.53%
Formula
Percentage change = [(355 - 511) / 511] x 100
Subtract the new number by the original number
355 - 511 = -156
-156 ÷ 511 = -0.30528375733855184
-0.30528375733855184 x 100 = -30.53%