-0.1% is the change from 997 to 996
Calculation steps:
[( 996 - 997 ) ÷ 997] x 100 = -0.1%
Formula
Percentage change = [(996 - 997) / 997] x 100
Subtract the new number by the original number
996 - 997 = -1
-1 ÷ 997 = -0.0010030090270812437
-0.0010030090270812437 x 100 = -0.1%