-31.61% is the change from 503 to 344
Calculation steps:
[( 344 - 503 ) ÷ 503] x 100 = -31.61%
Formula
Percentage change = [(344 - 503) / 503] x 100
Subtract the new number by the original number
344 - 503 = -159
-159 ÷ 503 = -0.31610337972166996
-0.31610337972166996 x 100 = -31.61%