-50.32% is the change from 622 to 309
Calculation steps:
[( 309 - 622 ) ÷ 622] x 100 = -50.32%
Formula
Percentage change = [(309 - 622) / 622] x 100
Subtract the new number by the original number
309 - 622 = -313
-313 ÷ 622 = -0.5032154340836013
-0.5032154340836013 x 100 = -50.32%