-50.48% is the change from 628 to 311
Calculation steps:
[( 311 - 628 ) ÷ 628] x 100 = -50.48%
Formula
Percentage change = [(311 - 628) / 628] x 100
Subtract the new number by the original number
311 - 628 = -317
-317 ÷ 628 = -0.5047770700636943
-0.5047770700636943 x 100 = -50.48%