-82.63% is the change from 990 to 172
Calculation steps:
[( 172 - 990 ) ÷ 990] x 100 = -82.63%
Formula
Percentage change = [(172 - 990) / 990] x 100
Subtract the new number by the original number
172 - 990 = -818
-818 ÷ 990 = -0.8262626262626263
-0.8262626262626263 x 100 = -82.63%