-0.45% is the change from 668 to 665
Calculation steps:
[( 665 - 668 ) ÷ 668] x 100 = -0.45%
Formula
Percentage change = [(665 - 668) / 668] x 100
Subtract the new number by the original number
665 - 668 = -3
-3 ÷ 668 = -0.004491017964071856
-0.004491017964071856 x 100 = -0.45%