-0.45% is the change from 666 to 663
Calculation steps:
[( 663 - 666 ) ÷ 666] x 100 = -0.45%
Formula
Percentage change = [(663 - 666) / 666] x 100
Subtract the new number by the original number
663 - 666 = -3
-3 ÷ 666 = -0.0045045045045045045
-0.0045045045045045045 x 100 = -0.45%