-2.87% is the change from 662 to 643
Calculation steps:
[( 643 - 662 ) ÷ 662] x 100 = -2.87%
Formula
Percentage change = [(643 - 662) / 662] x 100
Subtract the new number by the original number
643 - 662 = -19
-19 ÷ 662 = -0.028700906344410877
-0.028700906344410877 x 100 = -2.87%