-1.27% is the change from 79 to 78
Calculation steps:
[( 78 - 79 ) ÷ 79] x 100 = -1.27%
Formula
Percentage change = [(78 - 79) / 79] x 100
Subtract the new number by the original number
78 - 79 = -1
-1 ÷ 79 = -0.012658227848101266
-0.012658227848101266 x 100 = -1.27%