-78.78% is the change from 311 to 66
Calculation steps:
[( 66 - 311 ) ÷ 311] x 100 = -78.78%
Formula
Percentage change = [(66 - 311) / 311] x 100
Subtract the new number by the original number
66 - 311 = -245
-245 ÷ 311 = -0.7877813504823151
-0.7877813504823151 x 100 = -78.78%