-20.78% is the change from 77 to 61
Calculation steps:
[( 61 - 77 ) ÷ 77] x 100 = -20.78%
Formula
Percentage change = [(61 - 77) / 77] x 100
Subtract the new number by the original number
61 - 77 = -16
-16 ÷ 77 = -0.2077922077922078
-0.2077922077922078 x 100 = -20.78%