-97.37% is the change from 797 to 21
Calculation steps:
[( 21 - 797 ) ÷ 797] x 100 = -97.37%
Formula
Percentage change = [(21 - 797) / 797] x 100
Subtract the new number by the original number
21 - 797 = -776
-776 ÷ 797 = -0.973651191969887
-0.973651191969887 x 100 = -97.37%