-84.38% is the change from 666 to 104
Calculation steps:
[( 104 - 666 ) ÷ 666] x 100 = -84.38%
Formula
Percentage change = [(104 - 666) / 666] x 100
Subtract the new number by the original number
104 - 666 = -562
-562 ÷ 666 = -0.8438438438438438
-0.8438438438438438 x 100 = -84.38%