-29.31% is the change from 911 to 644
Calculation steps:
[( 644 - 911 ) ÷ 911] x 100 = -29.31%
Formula
Percentage change = [(644 - 911) / 911] x 100
Subtract the new number by the original number
644 - 911 = -267
-267 ÷ 911 = -0.29308452250274425
-0.29308452250274425 x 100 = -29.31%