-20.2% is the change from 797 to 636
Calculation steps:
[( 636 - 797 ) ÷ 797] x 100 = -20.2%
Formula
Percentage change = [(636 - 797) / 797] x 100
Subtract the new number by the original number
636 - 797 = -161
-161 ÷ 797 = -0.20200752823086573
-0.20200752823086573 x 100 = -20.2%