-15.95% is the change from 771 to 648
Calculation steps:
[( 648 - 771 ) ÷ 771] x 100 = -15.95%
Formula
Percentage change = [(648 - 771) / 771] x 100
Subtract the new number by the original number
648 - 771 = -123
-123 ÷ 771 = -0.15953307392996108
-0.15953307392996108 x 100 = -15.95%