-2.08% is the change from 817 to 800
Calculation steps:
[( 800 - 817 ) ÷ 817] x 100 = -2.08%
Formula
Percentage change = [(800 - 817) / 817] x 100
Subtract the new number by the original number
800 - 817 = -17
-17 ÷ 817 = -0.0208078335373317
-0.0208078335373317 x 100 = -2.08%