-7.11% is the change from 689 to 640
Calculation steps:
[( 640 - 689 ) ÷ 689] x 100 = -7.11%
Formula
Percentage change = [(640 - 689) / 689] x 100
Subtract the new number by the original number
640 - 689 = -49
-49 ÷ 689 = -0.07111756168359942
-0.07111756168359942 x 100 = -7.11%