-21.38% is the change from 800 to 629
Calculation steps:
[( 629 - 800 ) ÷ 800] x 100 = -21.38%
Formula
Percentage change = [(629 - 800) / 800] x 100
Subtract the new number by the original number
629 - 800 = -171
-171 ÷ 800 = -0.21375
-0.21375 x 100 = -21.38%