-7.14% is the change from 238 to 221
Calculation steps:
[( 221 - 238 ) ÷ 238] x 100 = -7.14%
Formula
Percentage change = [(221 - 238) / 238] x 100
Subtract the new number by the original number
221 - 238 = -17
-17 ÷ 238 = -0.07142857142857142
-0.07142857142857142 x 100 = -7.14%