-2.45% is the change from 817 to 797
Calculation steps:
[( 797 - 817 ) ÷ 817] x 100 = -2.45%
Formula
Percentage change = [(797 - 817) / 817] x 100
Subtract the new number by the original number
797 - 817 = -20
-20 ÷ 817 = -0.02447980416156671
-0.02447980416156671 x 100 = -2.45%