-83.22% is the change from 989 to 166
Calculation steps:
[( 166 - 989 ) ÷ 989] x 100 = -83.22%
Formula
Percentage change = [(166 - 989) / 989] x 100
Subtract the new number by the original number
166 - 989 = -823
-823 ÷ 989 = -0.8321536905965622
-0.8321536905965622 x 100 = -83.22%