-20.47% is the change from 806 to 641
Calculation steps:
[( 641 - 806 ) ÷ 806] x 100 = -20.47%
Formula
Percentage change = [(641 - 806) / 806] x 100
Subtract the new number by the original number
641 - 806 = -165
-165 ÷ 806 = -0.20471464019851116
-0.20471464019851116 x 100 = -20.47%