-9.06% is the change from 309 to 281
Calculation steps:
[( 281 - 309 ) ÷ 309] x 100 = -9.06%
Formula
Percentage change = [(281 - 309) / 309] x 100
Subtract the new number by the original number
281 - 309 = -28
-28 ÷ 309 = -0.09061488673139159
-0.09061488673139159 x 100 = -9.06%