-19.93% is the change from 803 to 643
Calculation steps:
[( 643 - 803 ) ÷ 803] x 100 = -19.93%
Formula
Percentage change = [(643 - 803) / 803] x 100
Subtract the new number by the original number
643 - 803 = -160
-160 ÷ 803 = -0.199252801992528
-0.199252801992528 x 100 = -19.93%