-1.21% is the change from 497 to 491
Calculation steps:
[( 491 - 497 ) ÷ 497] x 100 = -1.21%
Formula
Percentage change = [(491 - 497) / 497] x 100
Subtract the new number by the original number
491 - 497 = -6
-6 ÷ 497 = -0.012072434607645875
-0.012072434607645875 x 100 = -1.21%