-38.17% is the change from 503 to 311
Calculation steps:
[( 311 - 503 ) ÷ 503] x 100 = -38.17%
Formula
Percentage change = [(311 - 503) / 503] x 100
Subtract the new number by the original number
311 - 503 = -192
-192 ÷ 503 = -0.3817097415506958
-0.3817097415506958 x 100 = -38.17%