-19.1% is the change from 780 to 631
Calculation steps:
[( 631 - 780 ) ÷ 780] x 100 = -19.1%
Formula
Percentage change = [(631 - 780) / 780] x 100
Subtract the new number by the original number
631 - 780 = -149
-149 ÷ 780 = -0.191025641025641
-0.191025641025641 x 100 = -19.1%