-90.03% is the change from 662 to 66
Calculation steps:
[( 66 - 662 ) ÷ 662] x 100 = -90.03%
Formula
Percentage change = [(66 - 662) / 662] x 100
Subtract the new number by the original number
66 - 662 = -596
-596 ÷ 662 = -0.9003021148036254
-0.9003021148036254 x 100 = -90.03%