-1% is the change from 998 to 988
Calculation steps:
[( 988 - 998 ) ÷ 998] x 100 = -1%
Formula
Percentage change = [(988 - 998) / 998] x 100
Subtract the new number by the original number
988 - 998 = -10
-10 ÷ 998 = -0.01002004008016032
-0.01002004008016032 x 100 = -1%