-64.86% is the change from 646 to 227
Calculation steps:
[( 227 - 646 ) ÷ 646] x 100 = -64.86%
Formula
Percentage change = [(227 - 646) / 646] x 100
Subtract the new number by the original number
227 - 646 = -419
-419 ÷ 646 = -0.6486068111455109
-0.6486068111455109 x 100 = -64.86%