-82.9% is the change from 386 to 66
Calculation steps:
[( 66 - 386 ) ÷ 386] x 100 = -82.9%
Formula
Percentage change = [(66 - 386) / 386] x 100
Subtract the new number by the original number
66 - 386 = -320
-320 ÷ 386 = -0.8290155440414507
-0.8290155440414507 x 100 = -82.9%