-74.77% is the change from 666 to 168
Calculation steps:
[( 168 - 666 ) ÷ 666] x 100 = -74.77%
Formula
Percentage change = [(168 - 666) / 666] x 100
Subtract the new number by the original number
168 - 666 = -498
-498 ÷ 666 = -0.7477477477477478
-0.7477477477477478 x 100 = -74.77%