-64.21% is the change from 637 to 228
Calculation steps:
[( 228 - 637 ) ÷ 637] x 100 = -64.21%
Formula
Percentage change = [(228 - 637) / 637] x 100
Subtract the new number by the original number
228 - 637 = -409
-409 ÷ 637 = -0.6420722135007849
-0.6420722135007849 x 100 = -64.21%