-99.6% is the change from 497 to 2
Calculation steps:
[( 2 - 497 ) ÷ 497] x 100 = -99.6%
Formula
Percentage change = [(2 - 497) / 497] x 100
Subtract the new number by the original number
2 - 497 = -495
-495 ÷ 497 = -0.9959758551307847
-0.9959758551307847 x 100 = -99.6%