-60.24% is the change from 166 to 66
Calculation steps:
[( 66 - 166 ) ÷ 166] x 100 = -60.24%
Formula
Percentage change = [(66 - 166) / 166] x 100
Subtract the new number by the original number
66 - 166 = -100
-100 ÷ 166 = -0.6024096385542169
-0.6024096385542169 x 100 = -60.24%