-6.76% is the change from 680 to 634
Calculation steps:
[( 634 - 680 ) ÷ 680] x 100 = -6.76%
Formula
Percentage change = [(634 - 680) / 680] x 100
Subtract the new number by the original number
634 - 680 = -46
-46 ÷ 680 = -0.06764705882352941
-0.06764705882352941 x 100 = -6.76%