-13.88% is the change from 771 to 664
Calculation steps:
[( 664 - 771 ) ÷ 771] x 100 = -13.88%
Formula
Percentage change = [(664 - 771) / 771] x 100
Subtract the new number by the original number
664 - 771 = -107
-107 ÷ 771 = -0.13878080415045396
-0.13878080415045396 x 100 = -13.88%