-3.94% is the change from 812 to 780
Calculation steps:
[( 780 - 812 ) ÷ 812] x 100 = -3.94%
Formula
Percentage change = [(780 - 812) / 812] x 100
Subtract the new number by the original number
780 - 812 = -32
-32 ÷ 812 = -0.03940886699507389
-0.03940886699507389 x 100 = -3.94%