-82.53% is the change from 990 to 173
Calculation steps:
[( 173 - 990 ) ÷ 990] x 100 = -82.53%
Formula
Percentage change = [(173 - 990) / 990] x 100
Subtract the new number by the original number
173 - 990 = -817
-817 ÷ 990 = -0.8252525252525252
-0.8252525252525252 x 100 = -82.53%