-34.79% is the change from 503 to 328
Calculation steps:
[( 328 - 503 ) ÷ 503] x 100 = -34.79%
Formula
Percentage change = [(328 - 503) / 503] x 100
Subtract the new number by the original number
328 - 503 = -175
-175 ÷ 503 = -0.34791252485089463
-0.34791252485089463 x 100 = -34.79%