-31.01% is the change from 503 to 347
Calculation steps:
[( 347 - 503 ) ÷ 503] x 100 = -31.01%
Formula
Percentage change = [(347 - 503) / 503] x 100
Subtract the new number by the original number
347 - 503 = -156
-156 ÷ 503 = -0.3101391650099404
-0.3101391650099404 x 100 = -31.01%