-17.22% is the change from 778 to 644
Calculation steps:
[( 644 - 778 ) ÷ 778] x 100 = -17.22%
Formula
Percentage change = [(644 - 778) / 778] x 100
Subtract the new number by the original number
644 - 778 = -134
-134 ÷ 778 = -0.17223650385604114
-0.17223650385604114 x 100 = -17.22%