-33.01% is the change from 512 to 343
Calculation steps:
[( 343 - 512 ) ÷ 512] x 100 = -33.01%
Formula
Percentage change = [(343 - 512) / 512] x 100
Subtract the new number by the original number
343 - 512 = -169
-169 ÷ 512 = -0.330078125
-0.330078125 x 100 = -33.01%