-74.02% is the change from 666 to 173
Calculation steps:
[( 173 - 666 ) ÷ 666] x 100 = -74.02%
Formula
Percentage change = [(173 - 666) / 666] x 100
Subtract the new number by the original number
173 - 666 = -493
-493 ÷ 666 = -0.7402402402402403
-0.7402402402402403 x 100 = -74.02%