-64.54% is the change from 643 to 228
Calculation steps:
[( 228 - 643 ) ÷ 643] x 100 = -64.54%
Formula
Percentage change = [(228 - 643) / 643] x 100
Subtract the new number by the original number
228 - 643 = -415
-415 ÷ 643 = -0.645412130637636
-0.645412130637636 x 100 = -64.54%