-86.04% is the change from 666 to 93
Calculation steps:
[( 93 - 666 ) ÷ 666] x 100 = -86.04%
Formula
Percentage change = [(93 - 666) / 666] x 100
Subtract the new number by the original number
93 - 666 = -573
-573 ÷ 666 = -0.8603603603603603
-0.8603603603603603 x 100 = -86.04%