-2.1% is the change from 286 to 280
Calculation steps:
[( 280 - 286 ) ÷ 286] x 100 = -2.1%
Formula
Percentage change = [(280 - 286) / 286] x 100
Subtract the new number by the original number
280 - 286 = -6
-6 ÷ 286 = -0.02097902097902098
-0.02097902097902098 x 100 = -2.1%