-76.09% is the change from 276 to 66
Calculation steps:
[( 66 - 276 ) ÷ 276] x 100 = -76.09%
Formula
Percentage change = [(66 - 276) / 276] x 100
Subtract the new number by the original number
66 - 276 = -210
-210 ÷ 276 = -0.7608695652173914
-0.7608695652173914 x 100 = -76.09%