-19.6% is the change from 806 to 648
Calculation steps:
[( 648 - 806 ) ÷ 806] x 100 = -19.6%
Formula
Percentage change = [(648 - 806) / 806] x 100
Subtract the new number by the original number
648 - 806 = -158
-158 ÷ 806 = -0.19602977667493796
-0.19602977667493796 x 100 = -19.6%