-31.47% is the change from 502 to 344
Calculation steps:
[( 344 - 502 ) ÷ 502] x 100 = -31.47%
Formula
Percentage change = [(344 - 502) / 502] x 100
Subtract the new number by the original number
344 - 502 = -158
-158 ÷ 502 = -0.3147410358565737
-0.3147410358565737 x 100 = -31.47%