-2.02% is the change from 99 to 97
Calculation steps:
[( 97 - 99 ) ÷ 99] x 100 = -2.02%
Formula
Percentage change = [(97 - 99) / 99] x 100
Subtract the new number by the original number
97 - 99 = -2
-2 ÷ 99 = -0.020202020202020204
-0.020202020202020204 x 100 = -2.02%