-19.4% is the change from 799 to 644
Calculation steps:
[( 644 - 799 ) ÷ 799] x 100 = -19.4%
Formula
Percentage change = [(644 - 799) / 799] x 100
Subtract the new number by the original number
644 - 799 = -155
-155 ÷ 799 = -0.1939924906132666
-0.1939924906132666 x 100 = -19.4%