-20.38% is the change from 780 to 621
Calculation steps:
[( 621 - 780 ) ÷ 780] x 100 = -20.38%
Formula
Percentage change = [(621 - 780) / 780] x 100
Subtract the new number by the original number
621 - 780 = -159
-159 ÷ 780 = -0.20384615384615384
-0.20384615384615384 x 100 = -20.38%