-97.12% is the change from 971 to 28
Calculation steps:
[( 28 - 971 ) ÷ 971] x 100 = -97.12%
Formula
Percentage change = [(28 - 971) / 971] x 100
Subtract the new number by the original number
28 - 971 = -943
-943 ÷ 971 = -0.9711637487126673
-0.9711637487126673 x 100 = -97.12%