-2.32% is the change from 819 to 800
Calculation steps:
[( 800 - 819 ) ÷ 819] x 100 = -2.32%
Formula
Percentage change = [(800 - 819) / 819] x 100
Subtract the new number by the original number
800 - 819 = -19
-19 ÷ 819 = -0.0231990231990232
-0.0231990231990232 x 100 = -2.32%