-90.79% is the change from 228 to 21
Calculation steps:
[( 21 - 228 ) ÷ 228] x 100 = -90.79%
Formula
Percentage change = [(21 - 228) / 228] x 100
Subtract the new number by the original number
21 - 228 = -207
-207 ÷ 228 = -0.9078947368421053
-0.9078947368421053 x 100 = -90.79%