-7.09% is the change from 691 to 642
Calculation steps:
[( 642 - 691 ) ÷ 691] x 100 = -7.09%
Formula
Percentage change = [(642 - 691) / 691] x 100
Subtract the new number by the original number
642 - 691 = -49
-49 ÷ 691 = -0.07091172214182344
-0.07091172214182344 x 100 = -7.09%