-15.93% is the change from 766 to 644
Calculation steps:
[( 644 - 766 ) ÷ 766] x 100 = -15.93%
Formula
Percentage change = [(644 - 766) / 766] x 100
Subtract the new number by the original number
644 - 766 = -122
-122 ÷ 766 = -0.15926892950391644
-0.15926892950391644 x 100 = -15.93%