-11.93% is the change from 285 to 251
Calculation steps:
[( 251 - 285 ) ÷ 285] x 100 = -11.93%
Formula
Percentage change = [(251 - 285) / 285] x 100
Subtract the new number by the original number
251 - 285 = -34
-34 ÷ 285 = -0.11929824561403508
-0.11929824561403508 x 100 = -11.93%