-89.91% is the change from 654 to 66
Calculation steps:
[( 66 - 654 ) ÷ 654] x 100 = -89.91%
Formula
Percentage change = [(66 - 654) / 654] x 100
Subtract the new number by the original number
66 - 654 = -588
-588 ÷ 654 = -0.8990825688073395
-0.8990825688073395 x 100 = -89.91%