-1.71% is the change from 997 to 980
Calculation steps:
[( 980 - 997 ) ÷ 997] x 100 = -1.71%
Formula
Percentage change = [(980 - 997) / 997] x 100
Subtract the new number by the original number
980 - 997 = -17
-17 ÷ 997 = -0.017051153460381142
-0.017051153460381142 x 100 = -1.71%