-24.3% is the change from 284 to 215
Calculation steps:
[( 215 - 284 ) ÷ 284] x 100 = -24.3%
Formula
Percentage change = [(215 - 284) / 284] x 100
Subtract the new number by the original number
215 - 284 = -69
-69 ÷ 284 = -0.24295774647887325
-0.24295774647887325 x 100 = -24.3%