-5.9% is the change from 305 to 287
Calculation steps:
[( 287 - 305 ) ÷ 305] x 100 = -5.9%
Formula
Percentage change = [(287 - 305) / 305] x 100
Subtract the new number by the original number
287 - 305 = -18
-18 ÷ 305 = -0.05901639344262295
-0.05901639344262295 x 100 = -5.9%