-21.17% is the change from 770 to 607
Calculation steps:
[( 607 - 770 ) ÷ 770] x 100 = -21.17%
Formula
Percentage change = [(607 - 770) / 770] x 100
Subtract the new number by the original number
607 - 770 = -163
-163 ÷ 770 = -0.21168831168831168
-0.21168831168831168 x 100 = -21.17%