-99.2% is the change from 497 to 4
Calculation steps:
[( 4 - 497 ) ÷ 497] x 100 = -99.2%
Formula
Percentage change = [(4 - 497) / 497] x 100
Subtract the new number by the original number
4 - 497 = -493
-493 ÷ 497 = -0.9919517102615694
-0.9919517102615694 x 100 = -99.2%