-31.81% is the change from 503 to 343
Calculation steps:
[( 343 - 503 ) ÷ 503] x 100 = -31.81%
Formula
Percentage change = [(343 - 503) / 503] x 100
Subtract the new number by the original number
343 - 503 = -160
-160 ÷ 503 = -0.31809145129224653
-0.31809145129224653 x 100 = -31.81%