-31.67% is the change from 502 to 343
Calculation steps:
[( 343 - 502 ) ÷ 502] x 100 = -31.67%
Formula
Percentage change = [(343 - 502) / 502] x 100
Subtract the new number by the original number
343 - 502 = -159
-159 ÷ 502 = -0.31673306772908366
-0.31673306772908366 x 100 = -31.67%