-2.7% is the change from 778 to 757
Calculation steps:
[( 757 - 778 ) ÷ 778] x 100 = -2.7%
Formula
Percentage change = [(757 - 778) / 778] x 100
Subtract the new number by the original number
757 - 778 = -21
-21 ÷ 778 = -0.02699228791773779
-0.02699228791773779 x 100 = -2.7%