-82.12% is the change from 990 to 177
Calculation steps:
[( 177 - 990 ) ÷ 990] x 100 = -82.12%
Formula
Percentage change = [(177 - 990) / 990] x 100
Subtract the new number by the original number
177 - 990 = -813
-813 ÷ 990 = -0.8212121212121212
-0.8212121212121212 x 100 = -82.12%