-4.85% is the change from 680 to 647
Calculation steps:
[( 647 - 680 ) ÷ 680] x 100 = -4.85%
Formula
Percentage change = [(647 - 680) / 680] x 100
Subtract the new number by the original number
647 - 680 = -33
-33 ÷ 680 = -0.04852941176470588
-0.04852941176470588 x 100 = -4.85%