-13.77% is the change from 770 to 664
Calculation steps:
[( 664 - 770 ) ÷ 770] x 100 = -13.77%
Formula
Percentage change = [(664 - 770) / 770] x 100
Subtract the new number by the original number
664 - 770 = -106
-106 ÷ 770 = -0.13766233766233765
-0.13766233766233765 x 100 = -13.77%