-19.17% is the change from 819 to 662
Calculation steps:
[( 662 - 819 ) ÷ 819] x 100 = -19.17%
Formula
Percentage change = [(662 - 819) / 819] x 100
Subtract the new number by the original number
662 - 819 = -157
-157 ÷ 819 = -0.1916971916971917
-0.1916971916971917 x 100 = -19.17%