-2.65% is the change from 679 to 661
Calculation steps:
[( 661 - 679 ) ÷ 679] x 100 = -2.65%
Formula
Percentage change = [(661 - 679) / 679] x 100
Subtract the new number by the original number
661 - 679 = -18
-18 ÷ 679 = -0.026509572901325478
-0.026509572901325478 x 100 = -2.65%