-5.7% is the change from 228 to 215
Calculation steps:
[( 215 - 228 ) ÷ 228] x 100 = -5.7%
Formula
Percentage change = [(215 - 228) / 228] x 100
Subtract the new number by the original number
215 - 228 = -13
-13 ÷ 228 = -0.05701754385964912
-0.05701754385964912 x 100 = -5.7%