-16.47% is the change from 771 to 644
Calculation steps:
[( 644 - 771 ) ÷ 771] x 100 = -16.47%
Formula
Percentage change = [(644 - 771) / 771] x 100
Subtract the new number by the original number
644 - 771 = -127
-127 ÷ 771 = -0.16472114137483787
-0.16472114137483787 x 100 = -16.47%