-19.32% is the change from 797 to 643
Calculation steps:
[( 643 - 797 ) ÷ 797] x 100 = -19.32%
Formula
Percentage change = [(643 - 797) / 797] x 100
Subtract the new number by the original number
643 - 797 = -154
-154 ÷ 797 = -0.1932245922208281
-0.1932245922208281 x 100 = -19.32%