-6.45% is the change from 279 to 261
Calculation steps:
[( 261 - 279 ) ÷ 279] x 100 = -6.45%
Formula
Percentage change = [(261 - 279) / 279] x 100
Subtract the new number by the original number
261 - 279 = -18
-18 ÷ 279 = -0.06451612903225806
-0.06451612903225806 x 100 = -6.45%