-3.29% is the change from 669 to 647
Calculation steps:
[( 647 - 669 ) ÷ 669] x 100 = -3.29%
Formula
Percentage change = [(647 - 669) / 669] x 100
Subtract the new number by the original number
647 - 669 = -22
-22 ÷ 669 = -0.03288490284005979
-0.03288490284005979 x 100 = -3.29%