-2.57% is the change from 817 to 796
Calculation steps:
[( 796 - 817 ) ÷ 817] x 100 = -2.57%
Formula
Percentage change = [(796 - 817) / 817] x 100
Subtract the new number by the original number
796 - 817 = -21
-21 ÷ 817 = -0.025703794369645042
-0.025703794369645042 x 100 = -2.57%