-11.52% is the change from 243 to 215
Calculation steps:
[( 215 - 243 ) ÷ 243] x 100 = -11.52%
Formula
Percentage change = [(215 - 243) / 243] x 100
Subtract the new number by the original number
215 - 243 = -28
-28 ÷ 243 = -0.11522633744855967
-0.11522633744855967 x 100 = -11.52%