-34.49% is the change from 777 to 509
Calculation steps:
[( 509 - 777 ) ÷ 777] x 100 = -34.49%
Formula
Percentage change = [(509 - 777) / 777] x 100
Subtract the new number by the original number
509 - 777 = -268
-268 ÷ 777 = -0.34491634491634493
-0.34491634491634493 x 100 = -34.49%