-40.5% is the change from 279 to 166
Calculation steps:
[( 166 - 279 ) ÷ 279] x 100 = -40.5%
Formula
Percentage change = [(166 - 279) / 279] x 100
Subtract the new number by the original number
166 - 279 = -113
-113 ÷ 279 = -0.4050179211469534
-0.4050179211469534 x 100 = -40.5%