-33.86% is the change from 511 to 338
Calculation steps:
[( 338 - 511 ) ÷ 511] x 100 = -33.86%
Formula
Percentage change = [(338 - 511) / 511] x 100
Subtract the new number by the original number
338 - 511 = -173
-173 ÷ 511 = -0.3385518590998043
-0.3385518590998043 x 100 = -33.86%