-24.3% is the change from 819 to 620
Calculation steps:
[( 620 - 819 ) ÷ 819] x 100 = -24.3%
Formula
Percentage change = [(620 - 819) / 819] x 100
Subtract the new number by the original number
620 - 819 = -199
-199 ÷ 819 = -0.24297924297924298
-0.24297924297924298 x 100 = -24.3%