-2.19% is the change from 502 to 491
Calculation steps:
[( 491 - 502 ) ÷ 502] x 100 = -2.19%
Formula
Percentage change = [(491 - 502) / 502] x 100
Subtract the new number by the original number
491 - 502 = -11
-11 ÷ 502 = -0.021912350597609563
-0.021912350597609563 x 100 = -2.19%