-70.68% is the change from 266 to 78
Calculation steps:
[( 78 - 266 ) ÷ 266] x 100 = -70.68%
Formula
Percentage change = [(78 - 266) / 266] x 100
Subtract the new number by the original number
78 - 266 = -188
-188 ÷ 266 = -0.706766917293233
-0.706766917293233 x 100 = -70.68%