-1.79% is the change from 502 to 493
Calculation steps:
[( 493 - 502 ) ÷ 502] x 100 = -1.79%
Formula
Percentage change = [(493 - 502) / 502] x 100
Subtract the new number by the original number
493 - 502 = -9
-9 ÷ 502 = -0.017928286852589643
-0.017928286852589643 x 100 = -1.79%