-9.21% is the change from 239 to 217
Calculation steps:
[( 217 - 239 ) ÷ 239] x 100 = -9.21%
Formula
Percentage change = [(217 - 239) / 239] x 100
Subtract the new number by the original number
217 - 239 = -22
-22 ÷ 239 = -0.09205020920502092
-0.09205020920502092 x 100 = -9.21%