-7.71% is the change from 687 to 634
Calculation steps:
[( 634 - 687 ) ÷ 687] x 100 = -7.71%
Formula
Percentage change = [(634 - 687) / 687] x 100
Subtract the new number by the original number
634 - 687 = -53
-53 ÷ 687 = -0.07714701601164484
-0.07714701601164484 x 100 = -7.71%