-21.07% is the change from 503 to 397
Calculation steps:
[( 397 - 503 ) ÷ 503] x 100 = -21.07%
Formula
Percentage change = [(397 - 503) / 503] x 100
Subtract the new number by the original number
397 - 503 = -106
-106 ÷ 503 = -0.21073558648111332
-0.21073558648111332 x 100 = -21.07%