-19.35% is the change from 770 to 621
Calculation steps:
[( 621 - 770 ) ÷ 770] x 100 = -19.35%
Formula
Percentage change = [(621 - 770) / 770] x 100
Subtract the new number by the original number
621 - 770 = -149
-149 ÷ 770 = -0.19350649350649352
-0.19350649350649352 x 100 = -19.35%