-17.27% is the change from 770 to 637
Calculation steps:
[( 637 - 770 ) ÷ 770] x 100 = -17.27%
Formula
Percentage change = [(637 - 770) / 770] x 100
Subtract the new number by the original number
637 - 770 = -133
-133 ÷ 770 = -0.17272727272727273
-0.17272727272727273 x 100 = -17.27%