-34.64% is the change from 511 to 334
Calculation steps:
[( 334 - 511 ) ÷ 511] x 100 = -34.64%
Formula
Percentage change = [(334 - 511) / 511] x 100
Subtract the new number by the original number
334 - 511 = -177
-177 ÷ 511 = -0.34637964774951074
-0.34637964774951074 x 100 = -34.64%