-30.08% is the change from 502 to 351
Calculation steps:
[( 351 - 502 ) ÷ 502] x 100 = -30.08%
Formula
Percentage change = [(351 - 502) / 502] x 100
Subtract the new number by the original number
351 - 502 = -151
-151 ÷ 502 = -0.300796812749004
-0.300796812749004 x 100 = -30.08%