-80.1% is the change from 990 to 197
Calculation steps:
[( 197 - 990 ) ÷ 990] x 100 = -80.1%
Formula
Percentage change = [(197 - 990) / 990] x 100
Subtract the new number by the original number
197 - 990 = -793
-793 ÷ 990 = -0.8010101010101011
-0.8010101010101011 x 100 = -80.1%