-2.71% is the change from 665 to 647
Calculation steps:
[( 647 - 665 ) ÷ 665] x 100 = -2.71%
Formula
Percentage change = [(647 - 665) / 665] x 100
Subtract the new number by the original number
647 - 665 = -18
-18 ÷ 665 = -0.02706766917293233
-0.02706766917293233 x 100 = -2.71%