-19.83% is the change from 802 to 643
Calculation steps:
[( 643 - 802 ) ÷ 802] x 100 = -19.83%
Formula
Percentage change = [(643 - 802) / 802] x 100
Subtract the new number by the original number
643 - 802 = -159
-159 ÷ 802 = -0.19825436408977556
-0.19825436408977556 x 100 = -19.83%