-2.53% is the change from 79 to 77
Calculation steps:
[( 77 - 79 ) ÷ 79] x 100 = -2.53%
Formula
Percentage change = [(77 - 79) / 79] x 100
Subtract the new number by the original number
77 - 79 = -2
-2 ÷ 79 = -0.02531645569620253
-0.02531645569620253 x 100 = -2.53%