-30.91% is the change from 909 to 628
Calculation steps:
[( 628 - 909 ) ÷ 909] x 100 = -30.91%
Formula
Percentage change = [(628 - 909) / 909] x 100
Subtract the new number by the original number
628 - 909 = -281
-281 ÷ 909 = -0.30913091309130913
-0.30913091309130913 x 100 = -30.91%