-75.53% is the change from 666 to 163
Calculation steps:
[( 163 - 666 ) ÷ 666] x 100 = -75.53%
Formula
Percentage change = [(163 - 666) / 666] x 100
Subtract the new number by the original number
163 - 666 = -503
-503 ÷ 666 = -0.7552552552552553
-0.7552552552552553 x 100 = -75.53%