-25.42% is the change from 830 to 619
Calculation steps:
[( 619 - 830 ) ÷ 830] x 100 = -25.42%
Formula
Percentage change = [(619 - 830) / 830] x 100
Subtract the new number by the original number
619 - 830 = -211
-211 ÷ 830 = -0.25421686746987954
-0.25421686746987954 x 100 = -25.42%